Determine whether the cause of the alarm. If the alarm is false (such as you not getting to the alarm panel in time to shut the alarm off), proceed through the steps. If you are unsure why the alarm is sounding, check to make sure everyone is safe and that the authorities do not need to be called. If you are unsure about safety or have other concerns, find a safe place and contact the authorities.
Shut all doors and windows that are linked to your security system. While your security system will vary from model and dealer, typically, alarms continue to sound and cannot be disarmed until all the "zones" (areas where alarm sensors have been installed) are "closed." Closing a zone means returning all doors and windows to their secured, shut position.
Walk to the alarm panel and find the key pad. Punch in your secret code. Alarm codes are typically three to eight numbers. Press the "Enter" button if necessary; some alarm systems, however, only require you to input your code.