I do not understand. the site you linked to does not have ads on the left and right.
I see an ad below the menu bar, and ads in the right sidebar as well as in the content. So you would need to be specific.
In weaver you can place ads in any content area, this means in the page content area, in a text widget placed in one of the sidebar widget area, or in any of the HTML insertion area (Advanced Options > HTML Insertion).
You can view all available areas in Xtreme in the insertion area page of the demo site below.