Vehicle Registration Fee vs Vehicle Property Tax (Virginia)

I read here that the reg fee is NOT deductible in VA but the Vehicle Property Tax is.  I did find a place where I can enter the reg fee BUT NOT a place where I can enter the Vehicle Property Tax.  I followed instructions but I am not seeing the "I'll chose what to work on link" which is part of the instructions to get to where I need to go to enter personal vehicle property tax.