Motorola

Hello. I'm having a problem with my razr v3t... I bought a ring tune and it asked me where i wanted to save it to, i chose memory card, now i cant use it as a ring tune but its in my mp3 player... how do i switch it to my phone... I hope i didn't just spend 4 bucks for 12 seconds of a song i cant even use!
Thanks in advanced
-maddie