Help please

[spurgy]

i feel kind of dumd ive had my mogul for a few days and ive gotten a lot of cool soft ware and alot of cool stuff from you guys and other sites. but for the life of me i cannot figure out how to change the sound that plays when i receive a text message. or how to put a different song to play when an alarm goes off. im pretty sure im just being stupid about this. your help would be greatly appreciated