1
Turn on the pen
Click the pen (Draw) at the top and pick one of the seven colours. On iPhone there are six.
2
Draw
Draw on the picture with mouse, finger or pen. The other viewers see the stroke at once, together with your pointer and your name.
3
Stop
Click Stop drawing.
Only viewers in the player see your strokes. They do not reach the sender’s encoder or grading system. So say in the call what you point at, or join the conference.