In order to pair a Nucleus M motor with the Nano 2 Hand Wheel, you can go into the menu of the Hand Wheel and select Connect, then 2.4G and select Channels.
You can use the icon in the top left corner to switch between Manual and Automatic pairing, then press Search on the menu and hold the Up and Down button on the M motor to enter EZ Mode.
Once the motor appears on the Hand Wheel display, you can press Confirm to sync them together.
You can then change the Motor No. to No. 1 via the menu on the M Motor to control the motor via the Hand Wheel.