On your confirmation email you have login information to log into the Attendee Service Center. You will login and "Modify my Registration" then "edit". Continue through until you see the ancillary page(proceedings will be listed), there are tabs on this page listing all the ancillary items. Click on the appropriate icon and it will list the available items. Continue through to the payment page, open the "waiver" form and sign and agree. Upon completion of payment you will receive a new confirmation with the items added listed.  If you need further assistance please feel free to contact us.