During installation, you should've created a super user account. This account can be used
to log in to the admin interface, which is available at
/admin on your server.
E.g. if your server is hosted at
and log in with the super user account.
User accounts can be created manually by an administrative user (including the super user), by email invitation, or by open signup if enabled.
Manually add user
To manually create a user, log in to the admin interface as described above. Under the Custom User header, there's a row labeled Users. Click the + Add button to create a new user. All that's needed is an email address and password.
Invite user by email
To invite a user by email to create an account, simply click the + Add button under the Invitations header, and enter their email address.