When one is logged in to Webex as an attendee, they can reclaim the host role using the Webex host key.
One with a role of teacher and up can access this host key in MEETS as follows:
Click on either the name of the session on the left hand panel, or on the name of the session on the right hand calendar>More Details.
The information window will open with the "Host Key" information:
In the Webex session, go to Participant>Reclaim Host Role. Enter the 6 digit host key and you will become the host.