Do you have a copy of your original 2018? Since your AGI was not filled in on your 1040X amended return, it must mean there were no changes to your AGI. You will need to get your AGI from your 2018 original return.
If you used TurboTax last year you can view your 2018 AGI by selecting Documents on the left hand side of your screen. Select View Documents from: Select 2018 on the drop down menu.
OR
You can obtain a copy of last year's tax transcript online using IRS link: https://www.irs.gov/individuals/get-transcript
OR
If you have a copy of your 2018 tax return, your AGI is located on line 7.
Thank you! Do I still tell the site that I did a 1040x and just put the AGI From my standard 1040, or do I just say I have a 1040 to work with?
You can state that you prepared a 1040X, but since Line 1 column A is blank, you would enter your AGI from your Form 1040.
In your example the line 7 value is blank. What value do I put?