Removing default ads section from custom theme

I love this new WP-Brown theme I recently implemented, but for the life of me I can not figure out how to remove (or otherwise modify) the “Advertisements” box in the upper right hand corner of the page. It doesn’t show up in the widgets section of site admin, or, as far as I can tell, anywhere else. How am I supposed to modify that section?

I’m a relatively new blogger and I’m enjoying it all immensely and want to delve deeper into the morass. My blog is located at http://jawesome.org/socialdeus/ (I promise I’m not fishing for views).

Thanks,

Grant