When you first enter a meeting, a pop-up will prompt you to choose which audio/video devices you wish to use during the conference
Choosing audio, video, or both requires you to select which webcam or mic you will be using
When these settings are complete, use the "Start conference" button to enter the meeting
Right click anywhere on the screen and select "Settings..." from the menu
Select "Allow" in the Privacy tab of the Flash Player Settings to turn on the microphone and camera
The microphone and volume settings can be edited in the Microphone tab.
Make sure that the correct microphone is selected (if you are using a headset you don't want it to be set for the built-in mic on your laptop)
The Camera settings tab lets you select a camera to use
When you are finished editing the Flash Player settings, click the "Close" button to save the settings and return to the conference.