I Need Help!!!!!!!!!!!!!!!!!!!!!

I got an Boost Mobile i730. Well I recently perchased the USB cord. I was looking forward to doing my wallpaper and ringtone in one day. But have been able to do so cuz i don't know where and how to put the music on my phone. So if one could I would truely be greatful.

Check the nextel forums, it was awhile back but when I looked up the software needed I do beleive it was and iden driver and then myjal or webjal