Man, it's easy as hell: Click on "Post New Thread" here in "Video Gallery", then click on this little film strip... rith in the line where you can click on "B" for bold letters or "I" for italic or "U" for underlined. That film strip is left from that little speech bubble.
Then a new thing shows up where you paste in the address of your video - in my case that was "http://www.youtube.com/watch?v=MTeIIA4lvbw". Click on "ok", add some text if you want to and to finish everything, click on submit new thread. Done!
By the way, what was wrong with your phone? Or was it really my shitty mobile phone company? Well, I guess we keep ththe answer to that in our mails at YT - where you got one... hope you saw it earlier when we did not meet as it was planned.