To add content, you need to add content using the widget areas on the right of the page (probably at the bottom of the widgets):
So you see the areas at the bottom of my list of widgets called, "Tabber - Reason Why Texas is Awesome"? You can drag widgets in there, like I have with Carousel.
Then, you can pull the actual Tabber Widget from your widgets on the left and place in a widget area on your site.
Let me know if that helps clear i up or not!
Thanks,
Elise


