Youtube extension

I installed the plugin Mobile Youtube and enable the plugin. But when I go in Mobile Joomla "Extensions" tab it does not recognize it as installed "No extensions installed."

What am I doing wrong? I have a lot of youtube vidoes embedded I want to have working on my mobile version.

"Extensions" tab doesn't exist in recent MobileJoomla releases (most likely it wasn't removed on MJ updates). Mobile Youtube is an usual plugin of "mobile" group/type. Just publish it to replace all the embedded youtube videos with thumbs and links to m.youtube.com to view.