Here is how you do it:
From this link:
http://motorola-global-eng.custhelp...148&p_created=1171398429&p_sid=ASzaizgj&p_sp=
Can I use a downloaded or transferred song as a ringtone?
Answer
You phone will allow you to use downloaded or transferred music as ringtones. The phone will support ringtones in MP3 or .wav formats. The song will have to be located on your phone, not your memory card.
To move a song from a memory card, and apply as a ringtone:
* Press the Center Select Key
* Scroll to and Select Media Gallery
* Scroll to and Select Sounds
* Press Options
* Scroll to and Select Switch Storage Device
* Scroll to and Select Memory Card
* Scroll to desired file
* Press Options
* Scroll to and Select Copy to Phone
Once the copy is complete:
* Press the Center Select Key
* Scroll to and Select Media Gallery
* Scroll to and Select Sounds
* If necessary, press Options
* Select Switch to Storage Device
* Select Phone
* Scroll to the desired file
* Press Options
* Scroll to and Select Assign as Ringtone
Applicable Products: MOTOKRZR K1m,Motorola Rapture? VU30,MOTOSLVR L72,MOTOSLVR L7c,MOTOSLVR L9, RAZR V3c (CDMA),V323i