You can renew your membership online in the account management section of runescape.com
To renew your membership you have to purchase a Club Penguin membership card. A card to renew your membership for 1 month is $5.95, for 6 months it costs $29.95, and for 12 monthss or a year it costs...
go toclubpenguin home click on membership and then click on the membership time you want fill out the form and there you have it! you mambership!
Go to the homepage, which is http://www.clubpenguin.com/ and then there is a link that says "membership".
Buy it like you did with your first one.