Thank you for your answers, and please excuse my confusion. When in the admin console, if I select the motion sensor, click "Set Options", it asks me to press the SET button, which is of course INSIDE the sensor.
I was under the impression that the advantage of setting Jumper 5 was that the settings were controlled by software, and you wouldn't need to open the sensor, where there were setting wheels anyway.
Am I missing something? (probably)