Hey @Nancyd! I responded to you in the other topic, but I'll just post here too - just in case you missed it!
Try this out: Plug in the device. A red start button should immediately appear. Hold the red button for a few seconds until you see the timer button. The timer button will appear in white to the right of the bottom set of numbers. Once you see it, you'll be able to press and hold the timer button and adjust accordingly.
Please let me know if this helps in any way and if this works!