You now have a problem. Online is only for 2018. You have to wait and see if your efile gets accepted. If they reject it for something you can change it around to be for 2018.
But if they accept it you need to wait some more for it to fully process and you get the first refund. Then you need to Mail in an Amended 1040X return to change it to be for 2018.
You can check your efile status here https://turbotax.intuit.com/tax-tools/efile-status-lookup/
How to amend an Online return https://ttlc.intuit.com/replies/7276596
Amended returns can only be MAILED not efiled.
Then You still need to do 2017. To do 2017 you have to buy the Desktop Download program here
https://turbotax.intuit.com/personal-taxes/past-years-products/
Or If you have a simple return You can fill out the blank forms for free.
Here are some blank forms & instructions for 2017
1040 https://www.irs.gov/pub/irs-prior/f1040--2017.pdf
Instructions https://www.irs.gov/pub/irs-prior/i1040gi--2017.pdf
1040A https://www.irs.gov/pub/irs-prior/f1040a--2017.pdf
Instructions https://www.irs.gov/pub/irs-prior/i1040a--2017.pdf
1040EZ https://www.irs.gov/pub/irs-prior/f1040ez--2017.pdf
Instructions https://www.irs.gov/pub/irs-prior/i1040ez--2017.pdf
2017 Tax Tables https://www.irs.gov/pub/irs-prior/i1040tt--2017.pdf
Publication 17 Tax Guide for 2017 https://www.irs.gov/pub/irs-prior/p17--2017.pdf
Don’t forget your state. And you will have to print and mail your returns. So be sure to attach copies of your W2s and any 1099s that have withholding on them. You have to mail federal and state in separate envelopes because they go to different places. Get a tracking number from the post office when you mail them for proof of filing.
