You can add and delete emails associated with your BIT account in the web portal.
Log in to the web portal at blueinktech.com. Select My Account from the left-hand menu, then select Account Emails.
Click "New Email" at the top of the screen. Double click in the new line for a type-able field, then type your new email address. Click "Save Changes".
Now you can remove your old email address if you would like to. Check the box in the Delete column to remove any old email addresses you no longer use and click "Save Changes". Make sure you have checked the "Send To" box next to the new email address.