To video chat or voice call using your camera or microphone, you must first enter a Room.
To create or enter a Room, click the video icon on the left-side control bar.
If you don't see a room, you can click the "Create a Room" button to make a new room.
From the Room, you can turn your camera or mic on from the tool bar at the top. (The camera and mic icons will appear between the Room name and the settings icon)
If you're having trouble turning your camera or mic on, please head to this article for trouble shooting tips.