[Theme: CleanSlide] Manually add an image to the bottom of sidebar?

Hello,

I’m running a WordPress site that uses the CleanSlide theme. I would like to add a small, static, image to the bottom of the sidebar, rather than have to use one of the three designated widget areas. I have explored around the dash and customize pages, but can’t seem to find a way to stick an image at the bottom of the sidebar.

Is there a way to do this? It seems like CleanSlide theme does not allow for any edits to be made to the sidebar, besides adding pages/posts of course. Perhaps there is a manual way of adding the image?

Many thanks,