how do i go back and enter my agi from last year?
You only need to enter the 2023 AGI to efile. Do you want to change to Efile?
You can try to switch to Efilehttps://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online/00/26985
Where to enter or correct the prior year AGIhttps://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/correct-2020-agi-turbotax-online/L8CM2xq5K_US_en_US?uid=ldcfnsib