You enter it where you enter all your codes ( not book codes ) and then cards will be added to your penguin.
you click unlock items online button and log in to your penguin and click i have a code
You have to make your own account on the 39 clues website, then look for the code on the card, click add card, and enter the code.
you have to get a club penguin card or book code to enter in and unlock cards and as you can see ...... Well Sensei has em' all!
If you have a membership card then you need to enter this code into the code box on the Timecard page. See related links.
If you have a Mash Up card code then you can enter this into the secret code box on the Moshi Monsters sign in page.
at valencia
If it is network pin code you can get that code and instruction how to enter it .,from Prounlocking.com
buy a card and enter code on fantage.com
5774
It does not have a code it can be obtained when you enter medusa plot book card codes.
If you have a secret code then you can enter this into the secret code box on the Moshi Monsters sign in page.
Yes
I believe that you can enter it on the Card code page.