It seems that you're using the online Free edition of Turbo Tax, and the Free edition doesn't include Schedule A used for itemized deductions, which you would need to claim a mortgage interest deduction. If however, you're really using one of the other editions, go to Federal, then Deduction and Credits, and finally Mortgage Interest, Refinancing, and Insurance. You'll be asked a series of questions about your mortgage and refinancing if any.
Have a look at this as well: https://ttlc.intuit.com/questions/1899651-what-kinds-of-refinancing-costs-can-i-deduct
And: https://ttlc.intuit.com/questions/1901495-can-i-deduct-mortgage-points
Answers are correct to the best of my ability but do not constitute legal or tax advice.
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