Why is my script saying " FindFirstChild is not a valid member of RBXScriptSignal"'?

I have tried everything upon changing the code, looking at the object browser and searching up similar events on other websites, but nothing had came across the same event as this.

Im not asking you to do all the work, but if you could explain to me what I did wrong and how I could fix it then that would be appreciated!

I have made a protection bubble out of a Ball that surrounds me inside it when I press the Q button. I wanted it to kill players that tried to touch it by looking if my localplayer name was theirs, and if it wasnt, it would kill them, but I have not used this script yet. Ty for your help and time!

Code:

local player = game.Players.LocalPlayer
local character = player.Character
local terrain = game.Workspace.Terrain
local ammo = 1

local x = Instance.new("Part")
	x.Size = Vector3.new(48,48,48)
	x.Transparency = 0.2
	x.Shape = "Ball"
	x.CanCollide = false
	x.Anchored = true
	x.BrickColor = BrickColor.new("Electric blue")
	x.TopSurface = "Smooth"
	x.BottomSurface = "Smooth"
	
local p = Instance.new("ParticleEmitter")
local f = Instance.new("ForceField")
local s = Instance.new("Smoke")
local sl = Instance.new("SurfaceLight")
local sp = Instance.new("Sparkles")
local color1 = Color3.new(121, 244, 255)
local color2 = Color3.new(226, 0, 255)

	p.Parent = x
	p.Color = ColorSequence.new(color1, color2)
	p.Rate = 250
	p.Speed = NumberRange.new(25)
	p.Size = NumberSequence.new(5)
	p.LightEmission = 100
	p.VelocitySpread = 808080
	
		s.Parent = x
		s.Color = Color3.new(75, 255, 234)
			sl.Parent = x
			sl.Range = 60
				sp.Parent = x
				sp.SparkleColor = Color3.new(144, 25, 255)	
						f.Parent = x
	
	game:GetService("UserInputService").InputBegan:connect(function(input)
    if input.KeyCode == Enum.KeyCode.Q then

	
local animation = Instance.new("Animation")
local humanoid = script.Parent:WaitForChild('Humanoid')			
				animation.AnimationId = "http://www.roblox.com/asset/?id=855830361"
				humanoid:LoadAnimation(animation):Play()
					wait(1)
	if ammo == 1 then
		ammo = 0
local clx = x:Clone()
local clf = f:Clone()
	clx.Parent = game.Workspace
	clx.CFrame = character.UpperTorso.CFrame * CFrame.new(0,0,0)
	clf.Parent = clx
		
		clx.Touched:FindFirstChild('Humanoid')
			if Humanoid.Parent.Parent.Name == "iizWishzii" then return
			elseif Humanoid.Parent.Parent.Name == "iizWishzii" then
				Humanoid.Health = 0
			end
		
		game.Debris:AddItem(clx, 10)
		wait(10)
		ammo = 1
		end
	end
end) 

This is the part of code that isnt working.

clx.Touched:FindFirstChild('Humanoid')
			if Humanoid.Parent.Parent.Name == "iizWishzii" then return
			elseif Humanoid.Parent.Parent.Name ~= "iizWishzii" then
				Humanoid.Health = 0
			end