Yes, you can edit/review your return any time before filing.
If you're in TurboTax Online, and in the File section, paid for your return, you can click back into any Federal or State sections.
When done editing, go back to File and complete the steps to Efile.
If you indicated you wanted to 'print for mailing', so TurboTax considers you already filed, scroll to the bottom and click on 'Add a State'.
This will get you back into your return.
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