We'll create fresh WordPress site with Add Pinterest Buttons To WordPress Plugin installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Once this plugin is activated it will automatically add the pinterest pin button to all the images within your content.
You will not have to change anything on your WordPress site.
This will hook into the in-built WordPress function to get the content, searches for all images inside the content and adds the pinterest button to the top right of the image.