In Turbotax Deluxe under Federal Taxes select Wages & Income.
Scroll down the page to Interest and Dividends.
Select Start on the Line Dividends on 1099-DIV on the next page select add dividend income.
Follow the screen prompts to the Page Lets get your 1099-DIV or Brokerage Details.
Check the box My form has info in more than box 1.
You will now see box 11 Tax Exempt Interest-Dividends, that is where you will enter your tax-free dividends.