You can enter it in the “Other Deductions” section of the interview. To get there select Find (the magnifying glass icon) from the top right. Type “other” in the search bar. Select “Other Deductions” from the list, then click “Go”. Continue through until you get to the Other Deductions page. There are several different boxes on this page to enter an amount. If none of them match your deduction, you can enter it at the bottom of the page.