The documentation portal is undergoing maintenance. During this period, you can't create any new user credentials. If you do, you'll need to recreate the user credential after the maintenance period ends.
The Application uses the email service available with the ActiveVOS Server. You need to enable the service and specify a mail server.
You configure the email service from the ActiveVOS Console. You can do this step now, while you are configuring the email templates, or you can configure the email service after you install the Application.