If you’re simply amending your return of your own volition, and Form 8962 hasn’t been requested by the IRS, please see the TurboTax Help article "How to amend (change or correct) a return you already filed" for instruction on how to amend your previously-filed tax return to include Form 8962. You’ll need your Form 1095-A, which you indicate that you have.
If the IRS has requested Form 8962 from you, please see the TurboTax Help article "The IRS is requesting Form 8962 for 2018" for additional guidance. Note that there are different ways to do this, based on whatever version of TurboTax you're using. They're shown in the three dropdowns near the bottom of the article.
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