1. First start your camera following these instructions as, in order to speak, you need to have the camera in use.
2. Once your camera is active a new icon will appear on the top center part of your student view:
3. To start speaking in the room, you have two options:
a. Push to Talk: click and keep the above icon pushed at all times while intervening
b. Lock Mic: when moving the mouse over the mic icon, a padlock will appear on its right; click it to lock the mic
Remember to unlock it again when you have finished speaking, in order to mute your device
NOTE: In touchscreen devices, once you have enabled the camera you would get two icons (microphone & padlock). If you want to lock the mic, just click on the padlock.