When in an Events VAC, on the right you will see the video lobby for this activity. Only Assessors and Attendees assigned to this specific activity will be able to access it.
You can toggle your camera and microphone on (shown in green) and off (shown in red) via the following icons:
Select the Settings cog in the video feed for additional options:
Via this menu, you will be able to access the following:
Change your selected camera and/or microphone.
Blur your background.
Not all browsers will support this - this will be flagged if yours does not.
cog in the video feed for additional options: