go to your music file folder and scroll down to the ringtone..once u scroll to it, u should be able to hit the options button and it should give u the option to use the tone or file as your ringtone
ok use this great site its www.phonezoo.com you can make an account add your phone number and pick you type of phone and then it will let you pick from thousands of different cool ring-tones sent to your phone as a text. it works like a charm I swear on it