Due to the WordPress.org Theme review guidlines we had to remove some functionality from the theme and place it in a plugin.
When you install Responsive and Responsive Pro you will get a notification asking if you wish to install the plugin.
Responsive Add Ons plugin is recommended when you have the Responsive Theme installed and active
After clicking on the install plugin you are taken to the suggested plugin installer, just click on “Install” below the plugin name
The plugin gets downloaded and installed automatically
Responsive Add Ons places its options inside Responsive’s theme options
Even if you don’t have the Responsive theme it will still add it’s functionality to any other theme. You will be able to find the options in the settings tab