There should be screws on the corners of the top. First, you'll have to remove the trim piece around the head unit, and use this write up to do that.
http://www.nicoclub.com/articles.php?id=294580
after that you should be able to see the screws, I think theyre phillips heads, but every once and a while theres some crazy star screws or hex bolts you come across. Just be prepared. As for the rest, it should be easy to dind them, then pull it out. I don't have pics, but I would imagine someone here might. Just try it first, get the trim plate off, which is very easy, then poke around and try and determine it yourself. It's a good learning experience too! and if you still can't Ill see if I can get a few pics next time I do some work on my system.