If you e-filed the original return and it was accepted, you have to wait for the return to be fully processed. Then you can use a Form 1040X to amend the return and pay any additional tax due. If you made any changes without using a 1040X, then restore the return to the way it looked when it was originally e-filed. (Any changes you made after the return was e-filed went nowhere. ) In order to amend, you have to be able to work from the return exactly as it looked when it was e-filed.
Then wait. After the return has been processed, you can amend correctly.
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