You just need to join the database one time. And if you've competed in a USAP sanctioned event in 2016 or later--you are already in!
Join a competition that plans to use Yue Score to organize, run, and score a competition. Check back to see who else is coming as well as to get important competition day info.
If you entered the wrong division, just make a NEW correct entry and ask the competition director to remove the incorrect one.
Wanna see who else will be at the Biathle? Search upcoming competitions and sort by division, distance, age, etc.