Go into the ring profile, click "Menu" and choose "New Exception", then move the cursor to "From", press Menu again and say "Add Name", choose the person, then change the "Custom Phone Tune"
btw, there's probably other ways to do that, but that's one way that i can tell you works for sure
I agree with reasking - there is so much junk in the threads that it's hard to find what you need. That and the forum software is slow and cumbersome
<<my 2 cents>>