The current bonus content information is emailed to you when you first sign up, and the new password is sent out right around the start of the annual MaxFunDrive. It's an email blast that goes out to a members-only segment on our MaxFun mailing list. Current members should have received an email containing the current password for the bonus content hub. Search your inbox, spam folder, and promotions tab for an email from firstname.lastname@example.org.
You can also view the current bonus content password at any time by going to maximumfun.org/manage and entering the email associated with your membership in the box found there. When you click "Look Me Up!" you'll be sent an email with a link to manage your membership. Follow that link, and the bonus content password will be displayed along with your membership information. Enjoy!