From Jobs / Dispatch

Double click on the desired job from the schedule.

Double click on the “Caller / phone # (click for list) link

Right click in the new window.

Choose “Add A New Contact Person”

Enter in the contact’s name.

Select Save.

Now Right click the contact’s name from the list.

Select “Add a new contact entry”

You can now add the contact’s phone number, mobile number, email address, etc.