How can I have an AGI without working..I only received two stimulus checks

Adjusted Gross Income (AGI) is the total income reported on your tax return (wages, self-employment income, interest, dividends) minus adjustments. Money that you received from stimulus payments are not added to your AGI. You do not have an AGI if you do not have any of the income mentioned in the statement above.

For additional information, please review the TurboTax article What is Adjusted Gross Income (AGI)?

Did you file a 2021 return?  You need your 2021 AGI to efile 2022. The AGI is on 2021 1040 line 11. 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 2021 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