To add a new rep:
In MCA Pilot, go to Settings > Workspace
Click the green "Manage Subscription" button, enter your billing email that you initially signed up with, verify with code
Increase the number of seats and update subscription
After ~5 seconds, the "New User" button will show up on the top right of the Team Members table - click it
Enter new rep's email, name, and optionally enter their Form ID in the "Unique App ID" field
And that's it.
If you ever need to delete a user, just hover your mouse over them and click the "Delete" button.
You'll see an available seat show up after 5 seconds and then you'll be able to add a new rep.