If you do not have a mortgage there is no need for you to complete a Form 1098.
To enter just the property taxes paid -
Click on Federal Taxes
Click on Deductions and Credits
Click on I'll choose what I work on (if shown)
Under Your Home
On Property Taxes, click on the start or update button
Or enter property tax in the Search box located in the upper right of the program screen. Click on Jump to property tax