This is how you can switch off the corresponding alarm time. Press the alarm button on the far left, then press the > or < button until OFF appears in the display. Then press Snooze until Saved appears in the display. For the next time, however, you must reactivate the alarm time.
Press the alarm button on the far left, then press the > or < button until ON appears in the display. Then press Snooze until Saved appears in the display.