To connect to Desktop.uib.no (aka Skrivebord.uib.no) from a Mac, you must do the following:
NB! In order to connect to desktop.uib.no, you must be connected to VPN first.
Install the Windows App (previously Remote Desktop) program from the Managed Software Center or from the Mac App Store.
Start the program.
Select New ( + ) > Desktop
Set the PC Name to skrivebord.uib.no and log in with your UiB user account