If you filed a tax return for the year that the W-2 is for then you will have to amend the tax return to add the W-2.
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
If you never filed the tax return for that year then you can complete and file a tax return using the TurboTax prior year desktop editions. Go to this TurboTax website for prior tax years, 2021 thru 2019, purchase, download and install the software for the tax year on a personal computer - https://turbotax.intuit.com/personal-taxes/past-years-products/
A prior year tax return can only be printed and mailed, it cannot be e-filed using TurboTax.
