Do you mean how to add text and images like the demo? I have tutorials at the top of the Epik forum here – https://appfinite.com/forum/epik-theme-support/ they are the highlighted sticky posts. You can drag a Text widget over into the widget area you want to use and you can add your text/html/images inside.
Here is an example – https://appfinite.com/topic/how-to-add-left-and-right-content-for-the-epik-theme-widgets/
Epik Widget location guide – https://appfinite.com/topic/epik-widgets-guide/