Yep, this has been brought up before as I recognize it's a bit confusing.
The way the plugin/menubar item works is that it looks for you to enter the YouTube video ID--the part at the end, as it includes the standard YouTube prefix already.
More info here: http://www.vbulletin.org/forum/showthread.php?t=111386&page=4
The way the plugin/menubar item works is that it looks for you to enter the YouTube video ID--the part at the end, as it includes the standard YouTube prefix already.
More info here: http://www.vbulletin.org/forum/showthread.php?t=111386&page=4