Try It Out Tutorial

Does anyone have a tutorial how to re-create the “Try It Out” section of http://www.favoriteposts.com? I want something just like it for my website. With a post list and favorites button in the lower left corner. And then the ability to the View Favorites in a pop-up modal like the one shown on this page.