Did you already e-file your federal return? If so, there are instructions on how to file your state return AFTER your federal has been filed. I'm linking a TurboTax FAQ below that should help you out. Please post back if you have further difficulty.
How do I e-file my state after I already filed my federal?
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***