Instructions:
1. Click the attached file and choose OPEN. It will now open in iTunes under the ringtones tab.
2. Sync your iPhone.
3. Grab your iPhone and select the new ringtone in Settings > Sounds > Ringtones.
Alternative way:
1. Save the attached file in a local folder on your computer.
2. Open iTunes and import the ringtone. It will show up under the Ringtones tab.
3. Sync your iPhone
4. Grab your iPhone and select the new ringtone in Settings > Sounds > Ringtones.