Shipment Tracking Event - Screen Set Name?

I need to modify the fields showing on the screen where Shipment Tracking Events are entered.  I have not been able to find a Screen Set that shows this screen.  Does anyone know where I would locate the place to change fields on this screen and what the name of it is?  I have tried looking in Manager Layouts and Advanced Layouts as well without luck.  I cannot find anything relative in the Help when I search either.

Any point in the right direction would be greatly appreciated.  I have attached a copy of what the screen looks like when accessed by a Service Provider.  It is split into two shots as the screen refused to scroll to capture in one shot.