@Iben, the video didn't show up because it wants to know the screen size.   Right below the embedded address, there are three check boxes. Check the 3rd on.  Worked for me.

<iframe title="YouTube video player" class="youtube-player" type="text/html" width="853" height="510" src="http://www.youtube.com/embed/rU9DCB2qL1Q" frameborder="0" allowFullScreen></iframe>

My vote for the Greatest Guitar Riff of all time goes to.
Savatage - "Hall of the Mountain King"

Judas Priest - "Breaking the Law"

Still working on the embed video using my next guess.

1_ Copy embedded HTML.

2_Go to forum, click on HTML.

3_Paste.

4_Update.{bottom left}

5_Post Reply... Voila

I don't think I have access to that function.

Alone But Not Lonely ~~~~~~~~~~~~~~ Mary Chapin Carpenter

Sure you do. OK.  {something different}    Right click on You Tube video.  Click on 'copy embedded HTML' that pops up. 

Come back to forum.    Click on HTML button, found on forum reply bar, then paste or ctrl+v.  You should see the embedded HTML code that you copied.

Click 'update'. Bottom left corner.  Then, post reply.

I have access but it rewrites the code I use and it does not seem to accept the video code at all for me.

I followed your instruction

Rush - "Working Man"

I think I will give up on the Video.

Rewrites the code?  I think this is the culprit. Click last highlighted button. {use old embedded code button} Then paste in forum. Hopin it works.

Old embed code looks like it works.