Select Amend (change) return, then Amend using TurboTax Online.
On the screen OK, let's get a kickstart on your 2023 amended return, select The IRS or state sent me a notice (this will allow you to amend only your state return without making changes to your federal) and Continue.
On the next screen, select Something else and Continue.
On the screen Tell us which 2024 return(s) you want to amend, select 2023 state.
Continue until the Let's work on your state taxes screen. Select Amend next to your state return, and continue through the screens to make your amendments.