Go to the homepage, which is http://www.clubpenguin.com/ and then there is a link that says "membership".
Chat with our AI personalities
Once your membership has run out&you renew it, you will get a line underneath your badge . you will receive another when you renew again&so on&so forth.
You get no membership and you get stuck with a lousy penguin when your membership runs out the only thing you can keep is you puffles, your room goes back to the normal boring blue room and all your clothes are shaded, meaning you cant use them untill you renew your membership. so getting a club penguin membership is not worth it
You can buy club penguin membership codes from the shop but unless you win one in a competition there is no such thing as a free club penguin membership code.
A membership that is unused
You can purchase in-game merchandise such as furniture inside your igloo, if you have a membership. However, if you decorate your igloo and your membership expires, your igloo will be stripped down temporarily until you renew. :-) Waddle on!