TO MAKE THE BUTTON ACTIVATE THE SCRIPT:

BUTTONNAMEHERE.MouseButton1Down:connect(function()
Scripthere
end)

Search you're Main and make it draggable like that

YOURMAINFRAMENAME.Draggable = true


To make it open you to

NameOFBUTTON.MouseButton1Down:connect(function()
NameOFURMAINGUI.Visible = true
NAMEOFOPENFrame.Visible = false
end)

To make it close you to

CLOSEBUTTONNAME.MouseButton1Down:connect(function()
NAMEOFOPENBUTTON.Visible = true
MAINGUINAME.Visible = false
end)

Then scroll up and search for

GUINAME.Parent = game.Workspace
change Workspace to CoreGui

GUINAME.Parent = game.CoreGui

[FOR GUI IF IT'S SCRIPTED TO LUA]

Gui visible (fade)

game.Players.LocalPlayer:WaitForChild("PlayerGui")