i just bought an pantech reveal. does anyone know how to assign ringtones on this phone?

[Kiwi]

i've checked out the book and the online tutorial. i can't find any information on it. on one site i visited, someone had left a comment that you could do that, but you had to save the contact to the phone instead of just the sim card. does anybody have any ideas? if there is a way to do it, it certainly isn't obvious. thanks so much!