You may add a state and file the return after your federal return has been accepted by following the steps below:
1. Sign in to TurboTax, if you're not already signed in.
2. Click Taxes in the upper left area (under the TurboTax logo).
3. In your Tax Timeline, click Add a state in the SOME THINGS YOU CAN DO section.
4. Once in your return go to the State Taxes tab and follow the prompts.