Can I correct adjusted gross income before filing electronically?

Yes you can edit the 2023 AGI before filing

To revisit the AGI section in TurboTax Online:

1. Sign in and open your return if you haven't already done so.
2. From the left menu, select File.
3. Select Start next to Step 3 (if needed, revisit Steps 1 and/or 2 to activate Step 3).
4. Select I want to e-file.
5. Continue until you see where to enter last year's AGI.