You’d think this would be easier. It’s just an image and it’s just a sidebar. The trouble is that the widgets (the content ares that populate sidebars) don’t have much as far as design or layout tools. So what do I usually do? I compose (create, design, etc. ) my image and text and alignment and links in a regular WP post or page (that I don’t need to save), then I copy out the code and paste it into a text widget in the sidebar.