Robot Theme for Exhibits

Good morning. I am new to Omeka and have run into a problem. Using the Exhibits plugin, I have created an exhibit with the Robot theme. I have noticed that the front page (left hand side), when previewed, has room for a picture or possibly rotating pictures. How do I insert an image here, as there seems to be no place, or at least that I can find, to tell the theme I want an image on the front page?