Dividend income reported to you on a Form 1099-DIV is entered on a federal tax return Schedule B.
The TurboTax Free online edition does not support Schedule B. You will need to upgrade to the Deluxe edition which does support Schedule B.
Go to this TurboTax website for the forms and schedules supported for each online edition - https://turbotax.intuit.com/personal-taxes/online/free-edition.jsp#tax-forms
