1. Under the Devices tab in your Harmony app tap Edit Devices, then + Device
2. Select ZIGBEE/Z-WAVE DEVICES and put your Motion Sensor in pairing mode by pressing the button next to the battery quickly 3 times
3. Once the Motion Sensor is found you can tap the pencil icon to rename it, then tap the X in the corner to go back
4. Tap Done on the bottom and your Motion Sensor is ready to rock
Your Motion Sensor will be listed under Sensors and the status is displayed under its name.
If you want Harmony to automatically turn on a lamp when motion is detected, check out this article: