How do I file my 2019 taxes so I can get my second stimulus check?

Filing the 2019 tax return now will not get you the second stimulus payment.  However, if you have income in 2019 then you still need to file a 2019 tax return.

You have to complete and file a 2020 federal tax return for stimulus payments you did not receive.

The stimulus questions are asked in the Federal Review section of the TurboTax program.  Any payment you were eligible to receive based on the 2020 Federal tax return but did not receive will be entered on the Federal tax return, Form 1040 Line 30 as a tax credit.  The credit is included in the federal tax refund or it will reduce the amount of federal taxes owed.

To complete and file a 2019 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2019 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/

A 2019 tax return can only be printed and mailed, it cannot be e-filed.