You can add an option to your registration by following the instructions below:
2) Type in your e-mail address (the email address you registered with) and
registrant ID (located in your email confirmation.
3) You are now logged into your
registration record. In the center of
the page, click the "Add Option"
button (you may need to scroll down a
bit).
4) A new window will appear for you
to select the item you'd like to
purchase and complete your
payment.