Paid Twice Last Year, How Do I Apply it This Year?

Hello,

 

Last year, I automatically paid via turbotax, but weeks later got an alert that I owed so without thinking, I panicked and paid again. When I realized I had paid twice, I called the IRS and they said they would not be refunding me - that I had to claim it this year when filing. How do I do that, and how do I do it via turbotax? I still have all the documentation showing the overpayment.