You can change or delete a timer on your Moto Watch 100 by:

1. Tilt your wrist or tap the top physical button to turn on the display
2. From the watch face, tap the top physical button again
3. Scroll down and tap on "Timer."
4. To edit an existing timer, tap the previously created timer to enter the edit screen.
5. From the edit screen, you can change the time and start the timer, or you can also press the red trash can icon to delete the timer.