Headunit

I'm not sure what went wrong or even where to begin to
troubleshoot. I have downloaded and installed headunit
successfully and am able to play DVD's, and populate
the database with music. I cannot, however, play the
music nor play CD's. I've seen screenshots of this and
know it is supposed to work. Also, along with other
buttons not working, the day/night does nothing. I am
very interested in your app. and would like to have
some sort of resolve. What can I do to figure this out?