Ask about how to edit a theme on WordPress?
 

To find and buy or download the theme, you can review the tutorial to find and install the wordpress theme offline, after downloading and installing is not the site you will have the same interface as the demo of the theme. To be the same as the original theme, you have to config or in other words edit it is new, this work it is difficult but too is not simple but also depends on the theme.

you can edit your theme by login to admin panel and their in dashboard