You can mute your microphone by selecting the microphone icon. A line will appear through the icon and no one will be able to hear you in the room. To unmute your microphone select the mic icon a second time so that the line is no longer visible.
To change your microphone and speakers, select the up arrow next to the microphone icon and select your microphone from the list that appears. There is an audio meter that will appear next to your selection and will indicate if audio is being sent to this selection.
You can select your speakers by scrolling down in the list and selecting your speakers.
To stop your camera, select the camera icon. A line will appear through the icon and no one will be able to see you. An image of a circle with letters will appear instead of your camera. To start your camera select the camera icon again so that the line is no longer visible.
If you have an external camera that you would like to use, make sure it is connected to the laptop and then select the up arrow next to the camera icon. You can select your camera from the list.