@Ldber1922 What software did you use to prepare and file 2018? Why are you asking how to "change the year?" If you just used the online program to prepare and e-file a 2018 return that was a big mistake. Online is only for 2019--no other year. If you used the online software and e-filed, the system is treating it like a 2019 return, and you have filed incorrectly on the the wrong tax year's forms. Was the return accepted? If you get lucky and it rejects, then your mistake will be easier to fix.
If the return you e-filed using online recently is rejected, delete that 2018 data, and use the account for your 2019 return. When you have deleted the 2018 income and put in your 2019 income instead, you can try to e-file it again. You will need to use "zero" as your AGI in order to e-file. If zero will not work, then you have to print, sign and mail the 2019 return.
If that incorrect return was accepted somehow, you have to wait for it to be processed and file an amended return later--that is more involved, so post back for further help if it is needed.
As for the correct way to file 2018:
Online preparation and e-filing for 2018 is permanently closed.
To file a return for a prior tax year
If you need to prepare a return for 2016, 2017, or 2018 you can purchase and download desktop software to do it, then print, sign, and mail the return(s)
https://turbotax.intuit.com/personal-taxes/past-years-products/
Remember to prepare your state return as well—if you live in a state that has a state income tax.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Note: The desktop software you need to prepare the prior year return must be installed/downloaded to a full PC or Mac. It cannot be used on a mobile device.
If you are getting a refund, there is not a penalty for filing past the deadline. If you owe taxes, the interest/penalties will be calculated by the IRS based on how much you owe and when they receive your return and payment. The IRS will bill you for this; it will not be calculated by TurboTax.
https://ttlc.intuit.com/questions/1900990-how-do-i-file-a-prior-year-tax-return
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
