Choose a username and password. Because the username will identify you
to others, it should be as anonymous or as personal as you wish. You
cannot change a username once it is entered. In order to do so, you
must register an entirely new account. Please choose your password
carefully and do not share it with others. The Auction Market relies
on the combination of username and password for all transactions and
must assume that any person using a correct username and password
combination is authorized to do so.
Usernames amd passwords are case sensitive and must be longer than
5 and less than 20 characters, numbers and underscores. Usernames
and passwords cannot start or end with an underscore.