It depends on how you entered your property taxes paid. If you entered them in the Form 1098 Mortgage Interest section, you will have to re-visit that section to edit the amount of property tax paid. If you entered in the property tax section, that's where you need to edit the entry. To make the edit, while logged in and in your return:
- Click on Federal Taxes
- Click on Deductions & Credits
- Select either "Mortgage Interest, ... (Form 1098)" or Property (Real Estate) Taxes and click Start/Edit