This is the default mechanism for a new installation of j5. Users are authenticated using a username and password created by the administrator using the Users configuration page. This is called the DBAuthenticator.
The default user (username: admin) is created automatically by the j5 Setup Wizard. Enter a password for this user in the j5 Setup Wizard to access the system initially.
Separate user accounts should be created for further admin users while keeping the default admin user for certain functions within j5.