Within the call, make sure that you are connected to the audio but that your microphone is muted. To communicate, simply type comments or questions into the text box on the right side of your screen, and make sure that it is directed to everyone. If Jack and Jill determine that your topic fits the flow of the call and should be discussed further, they might ask you to unmute yourself and talk with them! Otherwise, they will read questions from the text box out loud and answer as many as they can.