need to make a mobile button that will act as the key Q?

So I've been trying to make a button so my sister and brother can play a small Spider-Man game i made. I am super nooby at coding, and I don't understand much of it at all. Could someone plz show me what to do? I managed to make the button on screen but it doesnt do anything here is the script I use for pc web swinging. How do I transfer it to mobile?

wait(0.25)
local q = nil
local e = nil
local a = nil
local b = nil
local ply = game.Players.LocalPlayer
local char = ply.Character
local mouse = ply:GetMouse()
local bp = Instance.new("BodyPosition",char.Torso)
local bg = Instance.new("BodyGyro",char.Torso)
local bgdest = Vector3.new()
local pfvalue = Instance.new("BoolValue",char)
local gas = nil
local numqe = 0
local numq = 0
local nume = 0
local nums = 0
local weightless = nil
bg.maxTorque = Vector3.new(0,0,0)
bp.maxForce = Vector3.new(0,0,0)
bp.P = 1500
mouse.KeyDown:connect(function(key)
    if key == "q" and not q and mouse.Target then
        if (mouse.Hit.p - char.Torso.Position).magnitude < 200 then
            pfvalue.Value = true
            a = mouse.Hit.p
            q = Instance.new("SelectionPointLasso",char)
            q.Color = BrickColor.new("White")
            q.Point = mouse.Hit.p
            q.Humanoid = char.Humanoid
            if char.Torso:FindFirstChild("Smoke") then
                game:GetService("Debris"):AddItem(char.Torso.Smoke,0)
            end
            if not weightless then
                weightless = Instance.new("BodyPosition",char.Head)
                weightless.maxForce = Vector3.new(0,1000,0)
                weightless.position = Vector3.new(0,1000,0)
                coroutine.resume(coroutine.create(function()
                    local current = weightless
                    wait(0.25)
                    if current == weightless then
                        weightless.maxForce = Vector3.new(0,750,0)
                    end
                end))
            end
        end
    elseif key == "e" and not e and mouse.Target then
        if (mouse.Hit.p - char.Torso.Position).magnitude < 200 then
            pfvalue.Value = true
            b = mouse.Hit.p
            e = Instance.new("SelectionPointLasso",char)
            e.Color = BrickColor.new("White")
            e.Point = mouse.Hit.p
            e.Humanoid = char.Humanoid
            if char.Torso:FindFirstChild("Smoke") then
                game:GetService("Debris"):AddItem(char.Torso.Smoke,0)
            end
            if not weightless then
                weightless = Instance.new("BodyPosition",char.Head)
                weightless.maxForce = Vector3.new(0,5000,0)
                weightless.position = Vector3.new(0,700,0)
                coroutine.resume(coroutine.create(function()
                    local current = weightless
                    wait(0.25)
                    if current == weightless then                       weightless.maxForce = Vector3.new(0,1000,0)
                    end
                end))
            end
        end
    elseif key == " " and (q or e) then
        if q then
            game:GetService("Debris"):AddItem(q,0)
        end
        if e then
            game:GetService("Debris"):AddItem(e,0)
        end
        q,e = nil, nil
        bgdest = char.Torso.Position + (char.Torso.CFrame.lookVector * 125)
        gas = Instance.new("Smoke",char.Torso)
        gas.Size = 0.1
        gas.Opacity = 0.25
        if not weightless then
            weightless = Instance.new("BodyPosition",char.Head)
            weightless.maxForce = Vector3.new(0,10000,0)
            weightless.position = Vector3.new(0,1000,0)
            coroutine.resume(coroutine.create(function()
                local current = weightless
                wait(0.25)
                if current == weightless then
                    weightless.maxForce = Vector3.new(0,5000,0)
                end
            end))
        end
    end
end)
mouse.KeyUp:connect(function(key)
    if key == "q" and q then
        if not e then
            pfvalue.Value = false
        end
        game:GetService("Debris"):AddItem(q,0)
        q = nil
        a = nil
        if weightless then
            game:GetService("Debris"):AddItem(weightless,0)
            weightless = nil
        end
    elseif key == "e" and e then
        if not q then
            pfvalue.Value = false
        end
        game:GetService("Debris"):AddItem(e,0)
        e = nil
        b = nil
        if weightless then
            game:GetService("Debris"):AddItem(weightless,0)
            weightless = nil
        end
    end
end)
pfvalue.Changed:connect(function()
    if pfvalue.Value == false then
        char.Humanoid.PlatformStand = false
        char["Left Leg"].CanCollide = false
        char["Right Leg"].CanCollide = false
        char["Left Arm"].CanCollide = false
        char["Right Arm"].CanCollide = false
    else
        char.Humanoid.PlatformStand = true
        char["Left Leg"].CanCollide = true
        char["Right Leg"].CanCollide = true
        char["Left Arm"].CanCollide = false
        char["Right Arm"].CanCollide = false
    end
end)
function grapple()
    wait()
    local pos = char.Torso.Position
    if q and e then
        local tab = {a.x,a.y,a.z,b.x,b.y,b.z}
        local x = {}
        numqe = numqe + 1
        local num = numqe
        for i = 1,3 do
            table.insert(x,(tab[i] + tab[i+3])/2)
        end
        bp.position = Vector3.new(unpack(x))
        bp.D = 10
        bp.maxForce = Vector3.new(4500 * (math.abs(pos.x-bgdest.x)/200) + 3000,4500 * (math.abs(pos.y-bgdest.y)/200) + 3000,4500 * (math.abs(pos.z-bgdest.z)/200) + 3000)
        wait(1)
        if num == numqe then
            bp.D = 0
        end
    elseif q then
        numq = numq + 1
        local num = numq
        bp.position = a
        bp.D = 10
        bp.maxForce = Vector3.new(4000 * (math.abs(pos.x-bgdest.x)/200) + 3000,4500 * (math.abs(pos.y-bgdest.y)/200) + 3000,4500 * (math.abs(pos.z-bgdest.z)/200) + 3000)
        bgdest = a
        bg.maxTorque = Vector3.new(5000,5000,5000)
        wait(1)
        if num == numq then
            bp.D = 0
        end
    elseif e then
        nume = nume + 1
        local num = nume
        bp.position = b
        bp.D = 10
        bp.maxForce = Vector3.new(4000 * (math.abs(pos.x-bgdest.x)/200) + 3000,4500 * (math.abs(pos.y-bgdest.y)/200) + 3000,4500 * (math.abs(pos.z-bgdest.z)/200) + 3000)
        bgdest = b
        bg.maxTorque = Vector3.new(5000,5000,5000)
        wait(1)
        if num == nume then
            bp.D = 0
        end
    elseif char.Torso:FindFirstChild("Smoke") then
        nums = nums + 1
        num = nums
        bp.position = bgdest
        bp.D = 10
        bp.maxForce = Vector3.new(4000 * (math.abs(pos.x-bgdest.x)/200) + 2000,4500 * (math.abs(pos.y-bgdest.y)/200) + 2000,4500 * (math.abs(pos.z-bgdest.z)/200) + 2000)
        bg.maxTorque = Vector3.new(6000,6000,6000)
        wait(1)
        if num == nums then
            bp.D = 0
        end
    else
        bp.maxForce = Vector3.new(0,0,0)
        bg.maxTorque = Vector3.new(0,0,0)
    end
end
mouse.KeyDown:connect(grapple)
mouse.KeyUp:connect(grapple)
while wait() do
    bg.cframe = CFrame.new(char.Torso.Position,bgdest)
end