I've read in the Wiki how it works but I don't understand it, this is what I've tried:
Main Game:
TP:SetTeleportSetting("test1",script.Parent.Parent.test) TP:Teleport(1938410195,game.Players.LocalPlayer)
test is a ScreenGui
Sub-place:
print(TP:GetTeleportSetting())
Output: Argument 1 missing or nil
The 2nd parameter of: SetTeleportSetting must be a String, Number, Bool, Nil value or a table.
On the :GetTeleportSetting you need to set a parameter to receive the data.
print(TP:GetTeleportSetting(info)