Script that only affects who clicked?

I need to make a script for my GUI that only works on the one who clicked? What do I do or use? Do I just need to use a localscript?

Use local script and here's the ouline of what you need

function onClicked()
 ---Put what you want it to do here
end

script.Parent.MouseButton1Click:connect(onClicked)

Well, try this:

function Clicked()
	local player = script.Parent.Parent.Parent.Parent -- The player in the 'Players' service.
	-- If  you put the button inside something, add a .Parent to it.

	-- Put your script here
end

script.Parent.MouseButton1Click:connect(Clicked) -- Put this script in the button

I hope that helped!