You'll need to add the information to what you’ve already input into the TurboTax program, amending your return.
Please see the TurboTax Help article How to amend (change or correct) a return you already filed for instruction on how to amend your previously-filed tax return.
Generally speaking, you need to amend a return when you’ve omitted income. See the TurboTax Help article Do I need to amend? for details.
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