How do you make a button that executes scripts on touch?

You can use the .Touched method of a BasePart (touchpad) in order to execute a piece of code when that BasePart is touched.

Example:

local part = workspace.Touchpad

part.Touched:Connect(function(hit)
	if hit and hit.Parent:FindFirstChild("Humanoid") then -- check if part is a character
		--execute code here 
	end
end)

Hope I helped. If you have any questions please let me know.