Information about judging can be found at https://www.novanorth.org/wp/?page_id=1858; a link to register is at the bottom of the page. On the NoVA North web site select Regional Tournament Judges under the Judges menu item at the top of the page; the Judges Training event in the Important Events list also has a link.
Judges who are volunteering on behalf of a team need to sign up before the team can be registered for the Regional Tournament. The team’s coach will need the ID number assigned as well as the exact name you provided (if you are known as Bob but registered as Robert the coach needs to identify you as Robert).