If you really want to get a free membership, you can wait until your penguin is 980 days old, and then you will be emailed a special message saying you can try out membership for a week.
If you want it after, before, or for longer than that, you can always buy membership certificates or cards, for example, at a store, or at https://secure.clubpenguin.com/membership/login.php
you need to buy the game card but I'm not sure where to get the certificate...
Go to this Adress: http://www.clubpenguin.com/gamecard
Sorry but I have to say you can't get a certificate for being a member on Club Penguin.
Honestly, no one is going to give you a free membership OK? If you're that desperate, don't be shy - talk to your parents and let them know how much you want a Club Penguin membership. In fact, why not ask your parents to buy you a membership for Christmas or your birthday? There, problem solved.
Your puffle has a certificate.
There is no way to do that.
Complete missions
buy any kind of puffle and there you have it a certificate
If you want membership, please go to the membership page on the Club Penguin site. I am a Club Penguin member and I didn't get any membership certificate sorry. I don't think it even exists.
Buy the game.
If you play and use your club penguin account lots in approximately 6 days it will appear in your mail box!
anyone?
No.