Samsung Juke How Do I Make A Ringtone Using My Music On My Samsung Juke?

How do I make a ringtone using my music on my samsung juke? - samsung juke

OK, I've just finished my Samsung Juke today, and I did everything to the configuration of one of my songs that I downloaded on my phone as a ringtone fiqure. I think you can do, I know how. Can someone please help me, I'm lost. Thank you:)