After you file

Actually, you probably can.  (In Home and Business)  go to the forms tab, then "open form".   Next screen, type in "explanation stm" and search.    Open one of the explanation statement forms that comes up.  The forms are pre-filled BUT you can right click on any pre-filled box, pick override, and then and type in whatever you want. Your new info will show in red indicating you have overridden what hat there before. The statement is supposed to e-file with the rest of your return (and no, I have not tried it yet).