Q: can't figure out stereo on 2007 Toyota Yaris

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i have a 2007 toyota yaris. it has the factory stereo still in it. all i've ever done is pop in CD's, listen to radio or use aux cord to listen to music off of my blackberry thru the system. i have NEVER paid attn to the buttons on the right that say "folder", "text", etc. i messed with them and they didn't seem to do anything. can someone tell me what they're for n how to use them?
(1) Answer
That's for MP3 CD's where you can divide music types/artists by folders when you create the disc on your home computer. So you could have a folder of music for each member of your family on one CD then scan between the folders to entertain whichever family member is in the car for you... Or you could have a folder for jazz, a folder for pop....