I don't know how to change my ringtone on my T-mobile sidekick II! Can somone help?

I just got a sidekick II from my friend but i can't change the ringtone! help me this is gay.I don't know how to change my ringtone on my T-mobile sidekick II! Can somone help?Look in the manual!! If not, there should be a setting thing on the mneu somewhere, go right through that. Otherwise looks like you kinda stuck. Excuse me for the blunt delivery!