Find "Ringtone"
Slide your finger down the display starting from the top edge of your phone.
Press the settings icon.
Press the settings icon.
Press Sound.
Press Ringtone.
Select your ring tone
Press the different ring tones to listen to them.
Once you've found a ring tone you like, press APPLY.
Return to the home screen
Press the Home key several times to return to the home screen.