Add the Ad at above and below the entry content

I am using Genesis Widget Areas Generator plugin. After activating this plugin you will get a new menu “Widget Generator” at left side panel. I am creating the two new widget areas for single post.

One is “Before Entry Content”.

Another one is “After Entry Content”.

Now navigate to Appearance -> Widgets page and you will get two new sidebars there. Drag&drop the Text widget there and paste your Ad code. Your Ad will show on every single post.