You can use the steps below to help you do this if you are still in the return. If you have already filed the return, log in and scroll down to Your tax returns & documents on home page. Then click Add a state (not really adding one) to get back into the return and follow the steps below; using the Search box in top right corner of the screen.
Helpful Info:
How does TurboTax calculate my estimated tax payments?
Can TurboTax calculate next year's federal estimated taxes?
