Sidebar on My Blog

I am confused. On: http://www.androideveryday.com/blog-2/ I do not see a sidebar. What did I go wrong? On the widget page I do see "Posts Sidebar" That works fine for single posts I use a plugin to limit where ads and the like appear called Display Widgets but see no problems there. I suspect that I just don't understand how the blog part of how the site works. Help appreciated