Yes, but it's a long process. You can amend using TurboTax even if you did not prepare the original return in TurboTax.
However, you will have to enter your original information exactly as you filed before you begin. In other words, you'd be doing your taxes for a second time–just not filing an original return.
After your info matches what you filed (and you paid for TurboTax) then you can start amending.
For instructions see How to amend (change or correct) a return you've already filed. If you do not see instructions for 2021, it means the 2021 amend section is not ready yet.
If you are filing a state return, you may have to amend state as well.
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