how to set purchased song as ringtone itunes?
['Click on the song you want to use to make a ringtone in your iTunes Music Library.', 'Click "Store," then "Create Ringtone."', 'Adjust the slider to choose a song segment for the ringtone. You are limited to 30 seconds.', 'Click "Preview" to listen to the ringtone. ... ', 'Click "Buy" to purchase the ringtone.']