What do you mean by "AP"? Does that mean an APO address (Army Post Office)?
If so, on your mailing address screen in the My Info (Personal Info) section, in the first box you have to choose the "Type" of mailing address from a dropdown menu. You can choose Military (APO, FPO, DPO). Then the screen reconfigures with different boxes. In a box lower down it asks you indicate whether it is APO or FPO or DPO from a dropdown menu. Once you make that indication, then a box called "state code" has a dropdown menu that shows 3 choices for the various military post offices.
