Form 1040X is generated by TurboTax when you do an amend. You can't e-file an amended return. It has to be mailed in. Please see the instructions below on when and how to amend your income tax return.
Until your return moves into accepted status, you won't be able to amend. In fact, you won't be able to do anything with your return.
But here's what you can do in the meantime:
Related Information: