How do I import an MP3 (or other audio) file from my computer, and then set it as a ringer option?
Plug your phone into the usb port on your computer.
When you see the USB icom in the top left corner, pull it down, you will see "USB connected" Tap on that and then tapon "mount" you can now access your phone as a removable disk drive and drag your music files onto the phone.
After you have you songs , when the one you want is playing, bring up the options menu and touch "use as ringtone" and that song will be your ringtone.
1. Start Contacts
2. Select the contact to change
3. Tap on menu, options
4. Tap on ringtone
5. Select ringtone
6. Tap OK
No additional app is needed to change ringtones.
Best of luck,
Try Ring Droid which is a very easy to use free app. You can select only part of a song to use as a ringtone and/or notification. This has worked so far with any song I have imported to my phone.