If you need your AGI from last year to e-file but are having trouble finding it, you can just print and mail your return (you don't need your AGI for that).
You can find your 2017 AGI:
The IRS requires your AGI for identity verification (if you didn't file in 2017, enter 0 as your AGI) when e-filing. But as long as you filed your taxes with us last year and are using the same account, your 2017 AGI will transfer automatically.
If your 2017 AGI didn't transfer, you might be in the wrong account.
How to make sure you’re in the right accountWhere to find your 2017 AGI in TurboTax Online/MobileThe best place to get this number is from your originally-filed 2017 federal tax return. You can’t get it from a W-2, 1099, or other income statement.
Choose the 1040 form you filed last year. Only use your originally-filed 2017 federal tax return, even if you amended it later.
Select your form to see where the AGI is located on each form.
Form 1040 – Line 37
I need form 1040x 2019, I need it attached to my last years return.
I need my agi from last year please I guess from 2019 tax
You need your 2019 AGI to efile 2020. The AGI is on 2019 1040 line 8b. If you filed a Joint return you use the same AGI for each spouse.
How to find the AGI.
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947
If you didn't file 2019 or filed it later in the year or mailed it, then try entering 0 for the AGI. If that doesn't work you will have to print and mail your return.
Or request a transcript from the IRS
https://www.irs.gov/individuals/get-transcript
@Avicente 21 Didn't you see my answer? Where do you get stuck?