Participants can not share their video or audio by default. This privileges must be set by the host of the meeting. To ask for permission to take the floor, you can click the human icon with the hand raised displayed on the top bar. The drop-down menu next to this icon allows you to change your Status or show your opinion about the topics that are being discussed.
If the host gives you permission to share your video, a webcam icon will appear in the top bar, and inside the video window the following message will be displayed: Start My Webcam.
To start sharing your video, click the Start My Webcam button or the webcam icon on the top of the screen.
You will be asked to confirm this action (if not done during the Audio Setup Wizard) and a preview video will be enabled to adjust the image preferences. Once the video is ready, you just need to click on Start Sharing to share it with the other participants.
The video screen will show the video recorded by your camera as well as the video of the other participants (once they have activated their webcams).
If the host enables your audio, a microphone icon will appear in the top bar. Another microphone icon will appear next to your user in the presenters list and the following message will be displayed:
To talk to the other participants you need first to enable your microphone. Click on the microphone icon on the top of the window to activate it and the icon will turn into green.
If the microphone works properly, the microphone icon on the top bar will start displaying waves. The microphone icon next to your user in the presenters list will also be activated.
To activate/deactivate the microphone you just need to click on it and the microphone icon. Notice that the icon will still be green but crossed-out when it is deactivated.
Next to the microphone icon there is a drop-down menu to adjust some of its features. You can monitor the sound level in Adjust Microphone Volume… to rise or limit the volume. If no audio bar is displayed, check that your microphone has been selected and that it works properly.