bukle up

Hey this might be a dumb question but whatever. How do you change folders on the cd player for an mp3 cd???? if there are multiple folders does it say when it reads the cd???
I have an 06 z. I made an mp3 cd the other day with about 100 songs on it but when i put in the the cd player it only plays 37 of them, I was reading the manual, but still couldnt figure out how to change the. help please!! thanks