To add to what DoninGA said, If you have already submitted your tax return and need to fix anything, you will need to amend it. If your return was rejected, you will be able to correct it.
Here's an article that will give you instructions on how to amend a return.
How do I amend my 2019 TurboTax Online return? - Community
Here's an article that will help you fix a rejected return.
How do I fix a rejected return? - Community
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