Hello

I need help to insert my code in my nissan primera radio. I have the security card with the code, but i don't know how to insert it, because i've bought my car used, ant the precedent owner didn't gave me the manuals, so i have no idea how to make that operation. My car is a Primera from 2000 and the radio a Blaupunkt with a especial configuration for the Primeras. I thank even the smalest help.