Form 5695 and Step by Step Interview

Energy Star website states "The Non-Business Energy Property Tax Credits have been retroactively extrended form 12/31/2017 through 12/31/2021 

 

I purchased an Energy Star Tankless Hot Water Heater that was placed in service September of 2018. 

 

It appears from the website that I would be entitled to a $300 credit (I have not taken any prior year credits for energy efficiency and the install was in my primary residence.  However, the Step-by-Step does not give me any selections that would apply. 

 

Please advise how to obtain the credit.