To turn off your alarm, tap the on/off switch next to the alarm you wish to deactivate. The switch will then turn gray, indicating the alarm is off.
This generally applies to alarms set within a device's clock or alarm application. The specific appearance might vary slightly depending on the device (e.g., Android phone). You should be able to see a list of your alarms, the time they are set for, and often the days of the week they are active.
