gamme radioset problem

[tyri]

i just got my new renalt clio ii and the cd-player needs a code i don't have!
where can it be written in car papers?
how could i remove the cd player in order to see if there is a s/n number in the back? can it help me to find the code in some way?
i haven't found something to help me remove it and i don't want do damage anything.
Could somebody help me?