Yes, you'll have to enter your property taxes in order to deduct them on your return. If you pay these as part of your mortgage payment -- and the amount does not appear separately on the form 1098 from your lender -- then you'll need to find out the specific figure.
A phone call to the lender might be the simplest way to find this out. In addition, many counties/municipalities have on their web site a property tax database accessible to the public. If so, you can enter some brief identifying info and verify property taxes you paid, usually going back several years.
Once you have the amount, you'll enter it in TurboTax by clicking on Federal Taxes, then Deductions & Credits, then under Your Home select Property Taxes and follow the prompts.
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