Modify the "Description" field on the left menu bar to add text or HTML code to your sidebar. Using basic HTML coding, you can add links, images and other elements to your sidebar.

Inserting a Sidebar Into a Theme on Tumblr. The addition of a sidebar to your business Tumblr benefits the theme by providing additional information about your business, outgoing links to partner ...

In its first major revision in more than a year, the Apache OpenOffice suite now comes with a sidebar, from which users can launch their favorite tools.