The Addynamo side-bar widget allows you to display Addynamo ads (relevant to content) in your sidebar.
Make sure that your WP template is widget enabled.
Make sure that you have entered your (correct) ad id, width and height in the widget settings.
Join the Addynamo revolution by clicking here to visit our site http://www.addynamo.com
Once you have logged in to Addynamo, you can get the dimensions from your embed code.