here is what I did:
Players.PlayerAdded:Connect(function(plr) plr:WaitForChild("PlayerGui"):WaitForChild("notif"):WaitForChild("question"):TweenPosition(UDim2.new(0.25, 0,0.25, 0),"In","Linear",1) end)
However, it doesn't work. :(
I tried to do find first child and it also doesn't work.
You can only alter guis while using local scripts.
If you entered something like this in a local script that is directly inside the gui you wish to tween, it should work:
script.Parent:TweenPosition(UDim2.new(0,0,0.25,0),"In","Linear",1)