Please help me, I can't make the frame appear after pressing the button

help me, I can’t make the frame appear after pressing the button

local ClickDetector = script.Parent.ClickDetector

ClickDetector.MouseClick:Connect(function()

while true do
	wait()
	script.Parent.Parent.Frame.BackgroundTransparency = script.Parent.Parent.Frame.BackgroundTransparency - 0.1
end

end

Your loop will change the BackgroundTransparency to 0 forever because you never told it to stop.
Use Tweens if you want the fade to be animated.

You probably changed the Visible property to false so you can’t see it at all.

use TweenService and next time use local more often to make writing easier

Can you show us the objects in the Explorer?