How to enter stereo theft code?

I hope this is the right subforum. Ok, I know I'm gonna get yelled at for this question but I did a search and it helped but I still dont know how to actually ENTER the code. I found the card in my owners manual case that I'm assuming is the card that people say to get the code off. It says "ANTI-THEFT SYSTEM Do not keep this card in your car....." then is says "Code No. Model Serial No." and has a little white box with four digit number that I'm assuming is the code along with the other numbers. But the four numbers are all above 6 so how am I supposed to enter it on the stereo. I may just be an idiot and maybe I'm just overlooking something but I dont get it! I've already entered codes 2 times before I read anything about it so I really dont want to get it wrong this time or I may be out $50 to a dealer.

Never mind. I found how to enter it in my owners manual. It was under "pleasant driving" for no reason.