You can manage your address book from your Better World Books Account.
First, sign in to your BWB account.
After that, you can click on "My Account" up at the top of the website.
Once you are in your account information, click on "Address Book" located on the left hand side.
After you click on "Address Book," it will give you the option to either add an address, delete an address, or edit an existing address. You can also select which of the addresses in your address book you would prefer to be your default shipping address.