In order for the players to be able to register for the current program, they must be marked as "Approved". To do so, go to the Program Registrations for the required program, select the players you wish to mark, and click "Mark as Approved" to mark them. Now they will be able to register for the program. Approving all players will approve all players on the registration.
Click "Mark All Approved".
"Check" the box next to the ID number.