To add staff members, you need to go here and click on the link in #4 on this list.
The process is simple, but you must include your name as the purchasing coach in order for new coaches to be approved. Approval takes 24 - 48 hours usually.
Check out this video for more details. It was originally created for the 3-4 Defense eCourse, but the process is the same for JDFB Insider Annual subscribers.