I just installed MotoCast on my new Razr Maxx so I could explore the music function, and it synced all of the music that was on my iTunes from my computer onto my phone, which is great. Now I want to pick one of the songs (I have like 800 in my iTunes library) as my ringtone for my phone, but I can't figure out how to do it. How do I make one of the songs in my MotoCast music library my new ringtone for my Razr Maxx?