[Theme: Spun] Insert Logo into Footer

I need to insert a logo into my footer as part of a content/advertising network that I’m a member of. Apparently it only “counts” if it’s in the footer, and not in the sidebar. Since Spun doesn’t give any access to the footer via widgets, can anyone help me figure out how to do this using the edit CSS area? It’s just a two-line html link tag.

My blog is Katie at the Kitchen Door.

Thank you!