The event Organizer has pre-determined you as a moderator who can go on-screen (share your audio/video) whenever you choose. Attendees can request to join you on-screen by sharing their audio/video, but they must be approved by a moderator to be brought on-screen.
Moderators see a blue button that says "Share Audio and Video." Moderators can go on-screen at any time by clicking this button.
Moderators see a "Moderation Panel" at the bottom left of their screen. When an attendee requests to go on-screen, their name and profile picture appear under the Moderation Panel.
The moderator can hover over the profile picture of an attendee they would like to add on-screen and click the "+" sign to add that attendee on-screen.
Attendees (non-moderators) see a blue button that says "Ask to Share Audio and Video." They must click this button to be added to the queue for moderators to then add attendees on-screen.