Watch this. Figure out how to set it as your ringtone. Do it. http://www.youtube.com/watch?v=Ci_-6pY-DzM
Simply First download the .flv of this video then convert its audio to .mp3, then in itunes right click the .mp3 file of the ringtone, and go to options at set a end time at :30 seconds right click it and select create ACC version, next go to Whaterver>itunes>folderthing>ringtone.m4a and rename it to .mr4 and tada. Its a ringtone.