Property taxes can be entered one of two places.
I'll take you to both and you should be able to find it.
Go to Federal Taxes
Deductions and Credits
to Your Home
first go to Mortgage Interest, Refinancing, and Insurance as there is a box for Mortgage Taxes Paid at the bottom of screen titled, "Tell Us More About Your Loan From ..."
Then adjust that amount, if not there go to:
still under Your Home, but go to next subheading, Property Taxes.