I suggest you post a sample of what your roster would look like using the Attachn=ment paperclip on Go Advanced. That way it is easier to help. Rosters can me very complex beasts or quite simple, so seeing yours will make it easier.

Basically, the easiest approach would be to rotate the staff names, leaving the roster itself fixed. This, every week/fortnight/4 weeks when you prepare the roster, just click the macro button which will move the name(s) from the top of the list to the bottom, giving the next name(s) the weekend row(s).