You don't fill out Form 8962 yourself. When you enter your Form 1095-A TurboTax will create Form 8962. See the following for instructions to enter Form 1095-A.
Where do I enter my 1095-A?
Did you get a letter from the IRS (LTR 12C) asking for Form 8962, and possibly other forms? If so, follow the instructions in the FAQ at the following link. At the bottom of the FAQ click the link for the type of TurboTax software that you are using.
The IRS is requesting Form 8962 for 2019
Also read the information at the following link on the IRS web site.
Understanding Your Letter 12C
