local HelpGUI = game.StarterGui.HelpGUI local help = script.Parent help.MouseButton1Click:Connect(function() HelpGUI.Enabled = true end)
Issue
You are using game.StarterGui.HelpGUI even though StarterGui is a holder for GUI objects and then when someone joins.
Fix
You change local HelpGUI = game.StarterGui.HelpGUI to local HelpGUI = game.Players.LocalPlayer.PlayerGui.HelpGUI, make sure this is all in a localscript and not a serverscript!
local HelpGUI = game.Players.LocalPlayer.PlayerGui.HelpGUI local help = script.Parent help.MouseButton1Click:Connect(function() HelpGUI.Enabled = true end)