You can find your 2018 Adjusted Gross Income (AGI) by:
Looking at line 7 on page 2 of your 2018 Form 1040 ....
See this TurboTax support FAQ for accessing prior year online tax returns - https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...
