Why Should you Register for a Meeting?
Registration lets the host gather information about the attendees, restrict access, and secure meeting information.
Not all meetings require registration. If your meeting does, you can register from the email invitation or from the WebEx site.
Once the host approves your registration, you receive a registration confirmation email. You can now join the meeting once it starts. If the meeting is already in progress, and the host has chosen to approve all registration requests automatically, you join the meeting immediately.
Register from an Email Invitation
Register from the WebEx Site