Many websites have a sidebar, typically on the right hand side of the page.  As this space is not normally utilized for site content, it is a great place to add widgets like plugins, tools, newsletter sign-ups, Facebook likes, etc.  

To add widgets into the sidebar Ezoic has created an easy to use app. You'll find it under the "Design" tab.

To add the widget you simply click on the Add a Widget button, insert the code, save, and drag the widget box into the location you wish to have it shown on your site.  Your widget is then activated!