How to make it so when the I click whit a tool the script runs?

I am new on scripting and I can't seem to figure out how to make it so when the I press on the screen the script runs. I'm trying to make a transformation as a tool. I found a YT video by Blur but instead of the transformation being a tool it's just the script and when you press P you transform. How do I make it so when I press the screen I transform and when I press it again I go back to normal?

Here's the Local Script that is in the starterpack:

local player =  game.Players.LocalPlayer
local uis =  game:GetService("UserInputService")
local remote = game.ReplicatedStorage:WaitForChild("Transformation")
local ts =  game:GetService("TweenService")

repeat wait(1)until player.Character.Parent == workspace

local char =  player.Character
local debounce = false
local active =  false
local cd =  1
local cam =  game.Workspace.CurrentCamera
local hum = char:WaitForChild("Humanoid")

uis.InputBegan:Connect(function(input,IsTpying)
	if input.keyCode ==  Enum.KeyCode.P and IsTpying == false then
		if debounce == false then
			debounce =  true
			if active ==  false then
				cam.CameraType = Enum.CameraType.Scriptable
				cam.CFrame = player.Character.HumanoidRootPart.CFrame *  CFrame.new(Vector3.new(0,0,-5))*CFrame.Angles(0,math.rad(180),0)
				ts:Create(cam,TweenInfo.new(1,Enum.EasingStyle.Quad,Enum.EasingDirection.Out,0,false,0),{CFrame = player.Character.HumanoidRootPart.CFrame *  CFrame.new(Vector3.new(0,-1,-4))*CFrame.Angles(0,math.rad(180),0)}):Play()

				remote:FireServer(active)
				active =  true
			elseif active ==  true then
				cam.CameraType = Enum.CameraType.Scriptable
				cam.CFrame = player.Character.HumanoidRootPart.CFrame *  CFrame.new(Vector3.new(0,0,-3))*CFrame.Angles(0,math.rad(180),0)
				ts:Create(cam,TweenInfo.new(1,Enum.EasingStyle.Quad,Enum.EasingDirection.Out,0,false,0),{CFrame = player.Character.HumanoidRootPart.CFrame *  CFrame.new(Vector3.new(0,0,-4))*CFrame.Angles(0,math.rad(180),0)}):Play()
				remote:FireServer(active)
				active =  false
			end
		end
	end
end)

remote.OnClientEvent:Connect(function()
	cam.CameraType = Enum.CameraType.Custom
	wait(cd)
	debounce =  false
end)

My version of the script inside the tool:

local player =  game.Players.LocalPlayer
local uis =  game:GetService("UserInputService")
local remote = game.ReplicatedStorage:WaitForChild("Transformation")
local ts =  game:GetService("TweenService")
local mouse = game.Players.LocalPlayer:GetMouse()

local char =  player.Character
local debounce = false
local active =  false
local cd =  1
local cam =  game.Workspace.CurrentCamera
local hum = char:WaitForChild("Humanoid")

local tool = game.StarterPack.Bloodlust
tool.RequiresHandle = false
tool.Parent = game.Players.LocalPlayer.Backpack

function onActivation()
	print("Tool activated")
end

tool.Activated:Connect(onActivation)



repeat wait(1)until player.Character.Parent == workspace

		if debounce == false then
			debounce =  true
			if active ==  false then
				cam.CameraType = Enum.CameraType.Scriptable
				cam.CFrame = player.Character.HumanoidRootPart.CFrame *  CFrame.new(Vector3.new(0,0,-5))*CFrame.Angles(0,math.rad(180),0)
				ts:Create(cam,TweenInfo.new(1,Enum.EasingStyle.Quad,Enum.EasingDirection.Out,0,false,0),{CFrame = player.Character.HumanoidRootPart.CFrame *  CFrame.new(Vector3.new(0,-1,-4))*CFrame.Angles(0,math.rad(180),0)}):Play()

				remote:FireServer(active)
				active =  true
			elseif active ==  true then
				cam.CameraType = Enum.CameraType.Scriptable
				cam.CFrame = player.Character.HumanoidRootPart.CFrame *  CFrame.new(Vector3.new(0,0,-3))*CFrame.Angles(0,math.rad(180),0)
				ts:Create(cam,TweenInfo.new(1,Enum.EasingStyle.Quad,Enum.EasingDirection.Out,0,false,0),{CFrame = player.Character.HumanoidRootPart.CFrame *  CFrame.new(Vector3.new(0,0,-4))*CFrame.Angles(0,math.rad(180),0)}):Play()
				remote:FireServer(active)
				active =  false
			end
		end
	end
end)

remote.OnClientEvent:Connect(function()
	cam.CameraType = Enum.CameraType.Custom
	wait(cd)
	debounce =  false
end)

The Script in serverscriptservice:

local remote = game.ReplicatedStorage:WaitForChild("Transformation")

remote.OnServerEvent:Connect(function(plr,active)
	local char =  plr.Character

	if active == false then
		for i,v in pairs(char:GetChildren())do
			if v:IsA("Part")then
				game:GetService("TweenService"):Create(v,TweenInfo.new(.7,Enum.EasingStyle.Quad,Enum.EasingDirection.Out,0,false,0),{Color = Color3.fromRGB(132, 8, 8)}):Play()
				v.Material = Enum.Material.Neon
			end


		end
		
		local Sound1 =  script:WaitForChild("DBZ_Beam_Charge"):Clone()
		Sound1.Parent =  char.HumanoidRootPart
		Sound1:Play()
		game.Debris:AddItem(Sound1,2)
		
		local pushmodel =  script:WaitForChild("Push"):Clone()
		pushmodel.Parent =  workspace
		pushmodel.Core.CFrame =  char.HumanoidRootPart.CFrame * CFrame.new(Vector3.new(0,-1,0))
		for i,v in pairs(pushmodel:GetChildren())do
			v.Anchored =  true
			local tween = game:GetService("TweenService"):Create(v,TweenInfo.new(1,Enum.EasingStyle.Quad,Enum.EasingDirection.Out,0,false,0),{Size = v.Size + Vector3.new(10,10,10),CFrame =  v.CFrame * CFrame.Angles(0,math.rad(180),0)})
			tween:Play()
			tween.Completed:Connect(function()
				local tween2 = game:GetService("TweenService"):Create(v,TweenInfo.new(.5,Enum.EasingStyle.Quad,Enum.EasingDirection.Out,0,false,0),{Transparency = 1})
				tween2:Play()
				tween2.Completed:Connect(function()
					game.Debris:AddItem(v,0)
				end)
			end)
		end
		spawn(function()
			wait(1)
			local flash =  script:WaitForChild("Flash"):Clone()
			flash.Parent =  plr.PlayerGui
			game.Debris:AddItem(flash,.5)
			
			local sound2 =  script:WaitForChild("Explosion"):Clone()
			sound2.Parent =  char.HumanoidRootPart
			sound2:Play()
			game.Debris:AddItem(sound2,1.5)
			for i,v in pairs(char:GetChildren())do
				if v:IsA("Part")then
					v.Material = Enum.Material.Plastic
				end
			end
		end)
		
		local BeamEffect =  script:WaitForChild("BeamEffect"):Clone()
		BeamEffect.Parent =  char
		BeamEffect.CFrame =  char.HumanoidRootPart.CFrame

		
		local weld =  Instance.new("Weld")
		weld.Part0 = char.HumanoidRootPart
		weld.Part1 =  BeamEffect
		weld.Name = "TransformationWeld"
		weld.Parent = weld.Part0
		
		char.Humanoid.Animator:LoadAnimation(script:WaitForChild("transformAnimation")):Play()
		local bodyVelocity =  Instance.new("BodyVelocity",char.HumanoidRootPart)
		bodyVelocity.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
		bodyVelocity.Velocity  = char.HumanoidRootPart.CFrame.LookVector*.0001
		game.Debris:AddItem(bodyVelocity,.8)
	elseif active == true then
		if char:FindFirstChild("BeamEffect")then
			char:FindFirstChild("BeamEffect"):Destroy()
		end
		if char.HumanoidRootPart:FindFirstChild("TransformationWeld")then
			char.HumanoidRootPart:FindFirstChild("TransformationWeld"):Destroy()
		end
		char["Left Arm"].Color = char["Body Colors"].LeftArmColor3
		char["Right Arm"].Color =  char["Body Colors"].RightArmColor3
		char["Torso"].Color = char["Body Colors"].TorsoColor3
		char["Right Leg"].Color =  char["Body Colors"].RightLegColor3
		char["Left Leg"].Color = char["Body Colors"].LeftLegColor3
		char["Head"].Color =  char['Body Colors'].HeadColor3
		
		local bodyVelocity =  Instance.new("BodyVelocity",char.HumanoidRootPart)
		bodyVelocity.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
		bodyVelocity.Velocity  = char.HumanoidRootPart.CFrame.LookVector*.0001
		game.Debris:AddItem(bodyVelocity,.8)
		
	end
	wait(1)
	remote:FireClient(plr)
end)

The developer hub has a great article that could help with that issue. Check it out here.