NO, you cannot change the year of the software you used. Be very glad that return was rejected if you used the current online software and entered 2016 income information. If it had been accepted you would just have a mess to deal with. The current online software is ONLY for preparing a 2018 return. Each tax year has its own software written for the tax laws in effect for the specific year.
Online preparation and e-filing for 2016 is permanently closed.
To file a return for a prior tax year
If you need to prepare a return for 2015, 2016, or 2017 you can purchase and download desktop software to do it, then print, sign, and mail the return(s)
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.
NO 2018 tax law is very different from 2016