HI, I just got an used Audi 4 Qattro 97 2.8 and don;t know how to use the radio. I guess the radio it;s used for a number of other things besides playing music, and I don;t want to hit the wrong bottons a lock the radio up. 1. I would like to know where I can get an Owners manual. 2. I would like to have the code for the radio, in case it locks. thank you.