Homepage Top Sidebar Size

Hello, My website is www.olifephotography.com. The text under the slider was entered using left and right sidebars. I'd like to be able to edit the entire area under the slider as one area instead of split into left and right sidebars. Would the top sidebar be good for doing that? If so, how do I make the space the width of the area under the slider. Is there another widget that would be good for homepage editing in that space?