I received a W2 last year but did not submit the taxes before the deadline. How would I go about for submitting for both this year and last?

A separate tax return must be completed for each tax year. The current online product can only be used for a 2019 tax return. You can use it for your 2019 return.

Your 2018 W-2 and any other 2018 information must be entered on a 2018 tax return. To do a 2018 return with TurboTax, you must buy, download and install on your computer the 2018 program. Here is a link to buy it: https://turbotax.intuit.com/personal-taxes/past-years-products/

A 2018 return cannot be efiled. It must be printed and mailed by you. Turbotax does not print and mail it for you. Use the instructions that will print as the first page of your printed return for instructions on what to include with your return and where to mail it.