Did TurboTax show you a screen with "A few things before we wrap up your state taxes"? Under the subheading, "Other Tax Situations" scroll down to Michigan Estimated Tax Payments and click on Start or Revisit. You may get here another way if TurboTax just announces to you that you may owe an estimated tax penalty.
You may see this screen

And you want to see this screen

Did TurboTax tell you that you owed an underpayment of estimated taxes for Michigan? If so, you should have come across these screens.
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