How to add images to Side Bar

Question,

How do I add a image to my side bar on twenty eleven theme. I have added a clickit link and would like to add a photo to drive more traffic to the link. Any help would be great. Thank You

[already asked here: http://wordpress.org/support/topic/how-do-you-add-photos-on-your-side-bar?replies=2 – please continue with the original topic]