Please make sure to go through all aspects of this article including notes at the bottom
First click on green go live button
Select YouTube live as the source
That will take you to where the the video leaves out and will make sense from that point on..
2 Notes Below:
If you followed the steps within the above video to set up your youtube live stream and are unable to place a checkmark to allow embedding then you need to get your account synced to an adsense account as a new rule by youtube.. Please see this article to help http://cszmedia.freshdesk.com/support/solutions/articles/14000052451-youtube-requirement-for-allow-embedding
If you hear yourself back during the broadcast it is coming from the player in the control room click on mute as seen in image below and or pause the stream