Yes, you can delete the dependent from your return that was rejected.
If you need to revisit the Dependents section in TurboTax Online, here's what you do:
- Open your return in TurboTax, if you aren't already in it. (To do this, sign in to TurboTax and click the Take me to my return/Fix my return button.)
- Search for personal information and then click the "Jump to" link in the search results.
- Follow the onscreen instructions to add or remove a dependent.
