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This answer assumes you haven't actually filed anything. If you have filed a return, and it was accepted (or mailed), the only way to change it is with a formal amended return, Form 1040X.
Have you already filed, paid, or registered?
If not, you should be able to use "Clear and Start Over."
FAQ: How do I clear and start over in TurboTax Online?
https://ttlc.intuit.com/replies/4248526
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