To sign up to bid you will need to create a bidding account by registering on the site as a customer. Be careful not to sign up as a Vendor. They are two different types of accounts. Vendor accounts are to be able to sell your items on the site. Customers accounts are to buy.

To create your account access the account registration page from the main menu “Sign In” section, choose the customer radio button and enter your information. Hit Submit and you will be logged in.

You can always test it by logging out and then logging back in.