Need help installing a cd player

I am new at this. Can anyone let me know how to install a cd player or tell me a place where I can find out how in a 2003 vw jetta

it's easy. I did mine recently, it didn't take long. go up to the top of the forums, and read the message called mk4 faq/diy. there's links in there to a few different step-by-step diagrams.

I'm new to this website and need some help. Can someone please tell me the color coding for the positive and negative wires on a stock radio in a 1994 vw jetta. We're trying to install a new head unit but theres no coding for the positive/negative wires? Any help is greatly appreciated.