1. From the home screen, swipe down from the top of the display to access Quick Settings.
   
2. Tap Settings.
   
3. Tap Notifications.
   
4. Tap the Ringtone drop-down.
   
5. Tap the desired ringtone.
   
6. To set a song as the ringtone, scroll to then tap Browse Music.
   
7. Navigate to then tap the desired song.