This is a great spot to put a small blurb with some information on what your blog is all about. Use a "Text" widget in your "Wide Sidebar" sibebar options in Wordpress. Whatever you put in the title will show about and whatever you put as text (or html) will show right here!
A handy thing about the sidebars in this theme is that they are split into multiple sidebars, and they are all labeled nice and neatly in the options. There is a Wide, Left and Right Sidebar, along with a Left, Mid, and Right Footbar (scroll down!). You can place anything into any of them!