Need to filefor a different year

The online software is only for a 2018 return.  You have not said what year you need to prepare a return for. If you are getting a tax refund there is no penalty for filing late.   It is too late to receive a tax refund for any tax year earlier than 2016, but if you owe tax you still need to pay what is owed.  After the IRS receives your return you will be billed for penalties and interest owed.

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)

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.