To add a new Online User an Account Administrator needs to log in and go to their User Account page. Next to the "Other Online Users" heading is an "Add User" link.
Clicking on this link will take you to a form asking for the name and email address of the new user. Submitting this form will send an email to the new user so that they can set up their password.
They will appear as a Pending (Incomplete) Online User until they set up a password.