If you have filed your tax return using the software for a different year, there is no way to change the year on the return. You would have to prepare your 2021 over again using TurboTax 2021. You can log in to TurboTax Online 2021 here: Sign In to TurboTax Online 2021
You would also need to contact the Canada Revenue Agency (CRA) to let them know about your mistake, so they can cancel the return that you incorrectly sent. If you are in Canada or the United States, you can call the CRA at 1-800-959-8281. If you are elsewhere you can call 613-940-8495. This page has more ways to contact the CRA: Contact the Canada Revenue Agency
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