Audio System Questions

I stumbled upon this forum today and this is my first post.

I purchased a 2002 Toyota Prius in February - I just found out that the CD player seems to be permanently on 'shuffle' and also I am not sure how to set the radio preset stations. Also I can't see how to change the bass and other audio settings.

There is an 'Audio' circular button on the dashboard but it doesn't seem to do anything. I have tried pressing it when different displays are up and also holding it down for a few seconds to see if that would help, but apparently not!

Any suggestions are welcome - I love my 'new' car and this is my only issue at the moment. My max mpg for my 60 mile commute so far is 49mpg.

Thanks in advance,
Lee