If you received W-2G gambling tax forms for the current tax year, then you have to report those winnings when you file. If you itemize your deductions, instead of taking the standard deduction, then you will also have the opportunity to deduct your gambling losses from your gambling winnings.
To enter your W-2G information in the right place, in any version of TurboTax, simply find the Search box near the top of your tax return. Next, type in the exact search terms "gambling winnings on w-2g." Then, after you hit Enter, click on the Jump To link option that will appear underneath your search terms. This will take you directly to where you need to be. There is a screenshot below (please click to enlarge) of this page. Note that your page may look slightly different, depending on your version of TurboTax.
From there, simply fill in your W-2G information. If you have more than one W-2G, you can repeat the process.
Thanks for asking this important question, and good luck with your future wagers!