Flip the switch on the right side of the clock. When the LED is on the alarm is active, when the LED is off the alarm is off (easy to remember!)
If the alarm is going off, the piezo will beep loudly and the display will flash. You can turn off the alarm by flipping the alarm switch on the side.
If you press a button, that will put the clock into snooze mode which will stop the beeping but keep flashing. After 10 minutes, the snooze will end and the alarm will continue to beep!
Press MENU to get into the config menu.
When you're done, press SET to save your changes.
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