Where can I add my 2019 taxes for this year

[SweetieJean]

You need to file a 2019 tax return?  You cannot  now do so using TT online. Rather, you must  purchase and install the 2019 desktop software and file by mail.

TurboTax® 2019 Tax Software for Filing Past Years’ Taxes, Prior Year Tax Preparation (intuit.com)

Or are you asking how to claim a 2019 tax refund on your 2020 return?

[DawnC]

What 2019 taxes are you trying to include on your 2020 tax return?    If you received a state income tax refund, the 1099-G is entered in the income section, see the link below.    If all three of the following are true, your refund counts as taxable income:

• You itemized deductions last year, instead of taking the standard deduction
• You claimed state and local income taxes (not general sales taxes)
• Claiming the deduction helped you increase your federal refund or lower your tax bill

Even when your refund is taxable, it may not be the entire amount. It depends on how much the deduction affected your refund or tax bill. Just answer a few simple questions about last year’s refund, and we’ll calculate the taxable amount for you.     Where do I enter a 1099-G for a state or local tax refund?

If you need to prepare a 2019 tax return, see this link.