If it's the same as Geminii 3.1 then
Menu > 6 > Expert Setup > communication setup
You can also do it by telnetting into your box doing it using command line "stuff".
Try a search on "mount"; you're looking for some "mount -t " examples (if that makes sense).
If no-one else helps or you don't find it I'll have a look later (busy now).
Hope that helps. Or maybe a 7025 owner will help