Write up and add a page showing how to add a sidebar to a theme. Include all necessary instructions. Do not include any links to any other pages.
For example, include instructions on how to find the sidebar coding in a theme's stylesheet. Then show how to change the coding so the theme now has more (or fewer) sidebars than before.
(I like Word Press, but the documentation is a little too involved. Go with the absolute basics. Treat everything you can do with a stylesheet (for example) as a separate page, and provide instructions for that. Group them all together in a TOC page called something like, "Fun Things to do With Style Sheets." Really, the documentation needs to be simplified, it's simply gotten to involved.)
BTW, I will figure out how to use this dang thing! :D