Take control of your media. Access all image sizes at the image insert and image link to field. See all attached images in your post listing page.
The Easy Way
In your WordPress admin, go to 'Plugins' and then click on 'Add New'. In the search box, type in 'SuperSlider-Media-Pop' and hit enter. This plugin should be the first and likely the only result. Click on the 'Install' link. Once installed, click the 'Activate this plugin' link.
The Hard Way
Download the .zip file containing the plugin, unzip. Upload the Superslider-Media-Pop folder into your /wp-content/plugins/ directory Find the Superslider-Media-Pop plugin in the WordPress admin on the 'Plugins' page and click 'Activate'