I have a customer using a mailbox for after-hours emergencies. They alternate who is on call and change the dialout using stored numbers. I set these up for them initially, they now need to modify one of these numbers in slot 7; however, in Personal Services, it will only allow them to modify 1-5.

How can I allow them to modify the others? The Samsung documentation says they can modify up to 9 numbers (although this won't be the first time the documentation has something incorrect).