First, make sure the Timer Feature is enabled under Digital Settings in My Profile.
When you begin a session, a timer with the time allotment for the current step will display at the top of your Slide Controller. The countdown will start once you click the red button with the forward arrow in the slide controller to advance past the step title slide. You can also start the timer manually by clicking the "play" button next to the time.
Once the timer has started counting down, you can pause with the "pause" button or to reset the current step’s full time allotment with the "undo" button.
The timer automatically resets to the appropriate time allotment at each new step.