Yes, you can make changes to your 2023 tax return if it has not been mailed yet.
However, as stated by xmasbaby0, you will not be able to use TurboTax Online to make those changes. You will need to have a 2023 desktop version of TurboTax in order to make any changes and re-print your 2023 return.
If you used TurboTax Online to print your 2023 return, see the following help article to learn more about how to get your 2023 tax data file so that you can edit it and make the needed changes:
How do I get a copy of the 2023 return I filed in TurboTax Online?
@lynnrayfield
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