Once you have filed your tax return online, you cannot make any changes until the IRS either accepts or rejects your return.
If your return is accepted, wait until the IRS has issued you a refund and then you'll use the 1040X form to amend your taxes. Use the following TurboTax FAQ for reference: How do I amend my 2019 TurboTax Online return? - Community
If rejected, return to your TurboTax account and re-open your return. Fix whatever caused the rejection and make any other changes you need to make. Then, re-file your return. Source: How do I fix a rejected return? - Community
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