COMPLETELY EDITED QUESTION:
I have a model which contains models named 1-13. When one of these models is clicked with a ClickDetector, a GUI will show which contains a close button. However, when the close button is clicked when I click another one of the screens, the GUI will not show. Here is my code:
local register = game.Workspace.Cashier
local frame = script.Parent
for i,v in pairs(register:GetChildren()) do
v.Screen.ClickDetector.MouseClick:Connect(function(Screen)
script.Parent.Parent.Enabled = true
end)
end

5 comments
The local script is for the GUI and when screen is clicked, I'm going to tween the GUI on the screen. Is this for the new, updated question or the old question as I figured out a solution that I was close tol.
um.. this is for this question.
Ah alright, I updated the question that's why I asked. I'll try now.
And how does the close button make the GUI go away? Does it disable it or does it make it invisible?
It tweens it out of the screen and then disables it.