Which years?
If you have a number of them, you should consult with a tax professional, particularly if there is tax due.
You will no longer be able to e-file with TurboTax and will have to use a desktop (installed) version; print and mail the returns. TurboTax tax supports tax years 2020-2023 currently.
See https://turbotax.intuit.com/personal-taxes/past-years-products/
