You will need to Add a lender.  Here are the steps:

• Click on Federal Taxes (Personal using Home and Business)
• Click on Deductions & Credits 
• Click on I'll choose what I work on (if shown)
• Next to Mortgage Interest, Refinancing, and Insurance, click Edit/Add
• On next page, select Add a lender

Click on 1st screenshot below for detail

Read the interview questions carefully. The loan you "paid off" or "refinanced" is usually listed first, since you had it the year before (click on the 2nd screenshot below). The new loan is not used to purchase your main home.

See this TurboTax FAQ for more information:

https://ttlc.intuit.com/replies/3300426