Catch Responsive – Featured Content

Hi - I am fairly new to Wordpress but this I am stuck on. I don't know where to edit the demo featured content and replace it with my own, and my own images. I've read through the forums but am at a loss! I don't know where to replace the images and the text boxes. I have edited the "Featured Content" title to my own and that doesn't change. And I have removed the subheadline and that didn't change either. I cannot figure this out. When I changed "Demo Feature Content" it comes up with Featured Page Content and everything disappears. I'm obviously missing a major step somewhere. I do know how to put featured images on a page (I watched the demo) but how do I get the images and text to change? I have changed it to 4 columns, that's the only thing that worked! I cannot find this anywhere! www.get-u-sorted.com