Youtube – How to hide the video panel on the YouTube live streaming dashboard

Right-click on the video and select Stop downloading. To start it up again click the pause/play button.

Another way is to move the slider all the way to the end or near end of the video timeline. That way only the few remaining seconds left to play will end up streaming down to your computer and when it finishes, that's it. No more buffering or loading.

I was also searching for this in vain. But I found out from the youtube blog that the right to livestream is reserved for "content partners whose accounts are in good standing." So you need to become a content partner to livestream as of right now. You can sign up to become a content partner at http://www.youtube.com/yt/creators/partner.html

To answer your question "So it is open for everyone?", No. It is not open to the public yet. They are beta testing with their content partners.

Source: http://youtube-global.blogspot.com/2011/04/youtube-is-going-live.html