The plugin displays a checkbox in the publish meta box to feature a post. The checkbox only appears on admin selected post types which can be selected in the Settings->Writing screen.
When a post is designated as featured:
featured-{$posttype}
classes via the post_class filter.Note: For the plugin to work on attachments, you must be using 3.5 or above. All other features will work on 3.1.0 and up.