If you efiled your tax return and it was rejected, then you can fix it in TurboTax and resubmit it or you could go to another tax preparer and have them prepare your return and file it.
If your tax return was accepted, the only way to change it is to prepare, print and mail an amended return form 1040X. You can do this on TurboTax or have another preparer do it. If another preparer does it, you must take the tax return you filed to them and they must recreate it exactly as it was filed before they can amend it.
A tax return that you print and put in the mail is considered accepted so it would also have to be amended with form 1040X to make any changes.
