Bypassing is used to disarm an individual sensor while the rest of your sensors are armed. It allows you to open a door or window, while the system's armed, and it won't set off an alarm.
To do this, start by selecting "Press To Arm"
You'll notice on the right side of the screen it shows your sensor list and gives you the option to select the "Bypass" boxes. Select the box for the sensor you wish to disarm.
Now, you can arm the system for "Stay" or "Away"
You're done! If you open the door or window you bypassed, your alarm won't go off.
Note: Once you have disarmed your system, your sensors will go back to default. Your sensor will never be permanently bypassed.