State tax filing

Yes, you can amend the Michigan (MI) return if you did not take the credit as indicated by @Hal_Al.

When you are in the MI return, you will see the screen images when you get to the screen labeled: Take a look at Michigan credits and taxes

• Use this link when you are ready to amend.  I need to amend my state return

In the MI return, when you get to the screen A few things before we wrap up your state taxes, you can select to amend your state return. See the images below.