If you want to change the youtube video feed. Find the video you want on youtube, on the right side you'll see a code marked "embed" , copy it.
Go to MFL page, For Commisioners>Setup , scroll to the bottom of the page and you'll see Home Page Message Setup , click on the homepage message that says Film Room or Theater Room.
You'll have a code similar to this
<p> </p>
<center>
<div id="movieTheater">
<id="movieScreen"><object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/mpqPt-0dI0U&hl=en"></param><embed src="http://www.youtube.com/v/mpqPt-0dI0U&hl=en" type="application/x-shockwave-flash" width="425" height="344"></embed></object><br /><font size="1"><a href="http://www.youtube.com/watch?v=P4Z6n9ECXHw">Fantasy Football: The Rap</a> - Watch more <a href="http://www.break.com/">free videos</a></font> </div>
<p> </p>
Insert your new code in place of the red area I've marked. Save and that's it.