When you start the amendment process, you should open the TurboTax return that you already filed. Indicate that you are going to amend the return (In fact, I don't think you can do most things do the return until you agree). Then add the 1099-DIV. You should not change any other entry.
TurboTax should generate a new form - 1040X.
You will need to print and mail the 1040X and any tax return pages that changed.
To learn more information on how to amend your return, please see this TurboTax FAQ.
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