I own two properties in IL (not rented out). One is my primary residence and other I also use frequently. When inputting property taxes, can I add both properties?

I want to add both properties to receive tax credit.  When I add both, it asks for tax amount that is not my primary residence.  When I review in TurboTax, it asks that I add Property Index Number (PIN) for adjacent property and after I complete, it asks for another.  To eliminate error, I basically inputted primary residence twice and secondary residence once.  I don't know what "adjacent property" means.  One of the properties is in city and other in suburbs.  How do I complete correctly?