I am assuming you changed it on line 1e, where it was reported on your 1099-b. I left this alone, since a few screens later you check the box that the cost basis on my statement is incorrect, opening up a box where you enter the corrected amount. There is nowhere to enter the date it was inherited. You addressed that issue when you entered inherited in the date acquired field (1b). They don't care what date it was inherited (or originally acquired, for that matter) once you flag it as inherited.
