The form is supported within TurboTax as stated in this link.
However, since you have already filed your returns, you also have the option of preparing and filing the city return directly through the Kansas City website using their Quick Tax efile link or mailing the forms. This link has both options available to you.
If you'd like to prepare them within TurboTax, you will need to start the process by following the steps in this link to amend the return. Once you are back in the interview sections, go through the state interview section of the program. When you get to the screen titled "File Kansas City Return(s)," select yes. This will allow you to prepare your city return within TurboTax.
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