How do I make mp3 work as ringtone?

[MCnDaHouse]

I am on Energy ROM. I have put a 15 to 20 second clip mp3 in mydocuments but cannot select it as a ringtone.

I see there is a ringtone directory. Do I need to move it in there? If so how? File explorer does not give me an option to move it.

Sorry for the noob questions, I am new to Windows Mobile and the TP2.

Thanks,

MC