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 the competition.
Need to change your swim time? You can do that here. If you entered the wrong division, just submit a NEW entry in the division you want and ask the competition director to remove your incorrect one.
Want to see who else will be at the competition? Search upcoming competitions and sort by division, distance, age, etc.