In order for other users to log into the forum, they must have a username and password registered with the external authentication system, and must also be added to the forum by an administrator. From the admin panel, an administrator can specify the group they wish to add the new users to, before entering user details for any new users they wish to register. When the submit button is clicked, the new users will be registered to the server and can now log in. Note that owing to constraints on the login system, there is no way to validate that any particular user account exists ahead of time, so entering an incorrect username will result in that user being unable to log in as the authentication server will never approve their account.