playBunny: I haven't used it, but if you go to your profile page, there is a box labeled "access code" or something like that. If you haven't used it, it will have an empty box next to "reset". Put a check mark in the box, then click "reset", and it generates a code.

As far as what you do with the code, I have no clue! But I'm pretty sure that is what he is talking about.