You can file an amended return by mail, but it is not likely to be processed in time to generate an economic impact payment (stimulus check) for you this year, unfortunately.
More than likely, you will claim your payment as a credit when you file your 2020 return in 2021.
To amend a return filed in TurboTax, log back into your account or open the program and select the option "amend a return that has been filed and accepted" and then follow the prompts.
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