This is the Top Feature area and there are two ways to edit the content
The first way is to edit the feature.php file where the content you're reading is located.
The second way is to just add text widgets or any other widget to the top feature location. That's the recommended method if you are not comfortable editing HTML code.
As you add widgets, save the theme options and this area will automatically detect the number of widgets and divide into equal-width columns, one for each widget.