If you need to change your speaker output, click the Settings button at the bottom-left side of the Attendee Console, which will bring up a panel from the right.
Click Grant Permissions in the panel to give your browser permission to access your webcam and microphone.
You can now click the drop-down to select a different speaker output. Confirm that your speaker is working by clicking Test.
As an attendee, you will not need a microphone or a webcam, but most browsers require you to grant your microphone and webcam permission to change your speaker. Your webcam will not turn on spontaneously by clicking Grant Permissions.