If you have not already filed your 2017 tax return, your AGI is $0.
This is the number to report to efile your 2018 tax return.
To prepare your 2017 tax return now, you must use a desktop program for which there is a charge. You will prep, print and mail because the IRS does not accept prior returns for e-file.
Follow this link for product information: Past Years
Products
You can call customer service to see if the fees you have already paid can be applied to the purchase of the product you need for your 2017 tax return. Call (800) 446-8848