The meeting room will auto-select a camera, microphone and speaker. If you use an external camera, microphone or speaker (Chrome only), it will normally select this one.
How do you change your microphone, speaker or camera?
Well that's pretty easy! You click on settings at the bottom of the screen.
On the left side you will see audio/video and be able to change the settings.
After you have changed you can always test if the new microphone/speaker works by by clicking on 'test your mic/speaker':
Test your mic: you can speak and afterwards listen if the microphone picks up the sound. The bars will indicate how loud your voice/noise is.
Test your speaker: you will hear the 'guest wants to enter' tune. (only available in Chrome).
Camera: your camera will start. Make sure your 'video and screen share quality' (under the camera setting) isn't set on audio only!