Adding motion detector

How can i add two more motion detector to my existing home plan

Sensors can be added at any time locally at your panel. You do not need to update your plan to add more alarm sensors like motion detectors.

Looks like this is referencing a Powerseries Neo, right? Programming of sensors in a DSC Powerseries Neo is described in the manual here. I believe page 52 is where it shows wireless device enrollment.