State tax filing

I have this same type problem where on my MI Homestead Property Tax Credit form it's not showing my correct zip code.  It's showing a dash and the 4 digit additional code.  I was not prompted to change this (like the OP was), so how do I correct this?  I'm not seeing anywhere to do this on the MI portion (I'm using TurboTax online).  My correct full zip code is included in the main portion of TurboTax at the beginning.  Please advise.  Thank you!!