Online is only good for 2019 now. If you tried to use the Online version for 2016 and entered 2016 info into the 2019 Online version you can try to clear and start over
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-onli...
Or you can leave this account and set up a new account to do 2019. How to start another return in the Online version
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
Then do you still need to file 2016? To do 2016 you have to buy the Desktop Download program here
https://turbotax.intuit.com/personal-taxes/past-years-products/
Or did you file a 2016 return and need to add this W2? Then you need to mail in an Amended 2016 return to add it.
