You can prepare an amended return with TurboTax @Banless and @venusrising. You will have to buy the software and download it to a computer.
Get an IRS transcript that will show what you actually filed. You will need your original information to correctly file an amended tax return.
You can obtain an IRS transcript at Welcome to Get Transcript.
You can also make an appointment and visit your local IRS office.
To amend 2020 using TurboTax see How do I amend my 2020 return?
You can also use the IRS fill-in forms. See About Form 1040-X, Amended U.S. Individual Income Tax Return.
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