katrina.ramunni on "[Plugin: Responsive Video Embeds] How to apply responsive embeds to videos uploaded from library"

How can I apply this plug in to videos that I upload from my libary?

When I inset the video, it appears as text but it doesn't seem to automatically pick up the plug in...
Is there a code I need to insert?

Thanks.

http://wordpress.org/plugins/responsive-video-embeds/