If you want to sign up for Area games, including Upper Division, Area 1-P Lower Division Regular Season, Area Playoffs and Extra games, you need to log in here. All of these competitions are hosted on the Region 76 inLeague site and if you have not already done so, you will need to register as a user on that site and activate yourself as a referee.
When you log in to the site, choose Referees and then Referee Schedule Signup. Make sure you choose the competition in which you want to referee. You will see on the left hand side a dropdown for Competition. Click on the down arrow next to that to see your choices.