Try this: click on the Federal Taxes tab, then Deductions & Credits, then scroll down to Your Home and click on Mortgage Interest, Refinancing, and Insurance (Form 1098).
TurboTax will ask if you paid any home loans and you'll click "yes." Then you'll be shown a box to type in the name of your mortgage lender. Next you'll answer some questions and come to a screen that says Let's get the details from your 1098 now. Here you'll see the entry boxes for mortgage interest, private mortgage insurance, and real estate taxes.
