Rubeus Hagrid, the Keeper of the Keys is in charge of way too many keys! It seems he lost track of one of them, and it's imperative that he finds it.
Somewhere on the site, a key has been hidden. It may be hidden behind an image, a word, or simply the key itself. Card pages are fair game.
When you find the key, the password is the page name which you found it on.
(ie: http://pink-ness.org/heart/members.php)