How do i make a gui that when you click it, it will go invisible?

This script needs to be placed in to a TextButton to have it working.

local gui = script.Parent --Which I hope is a TextButton
gui.MouseButton1Down:connect(function()
	gui.Visible = false
end)

I suggest going to http://wiki.roblox.com/index.php/Beginner's_guide_to_GUI if you're new to GUI's