With an administrator account, extra interfaces are available in the frontend UI e.g.
Here you can view all users and edit their profile. Clicking on the pencil will allow you to change their e-mail, deactivate the account and set a new password for the user.
Here you can add a new user with a valid e-mail account. If you make the user a superuser, they also gain administrator privileges. If the SMPT settings in
.env are not in use or invalid, notify the user of their account credentials manually.