Right below the chat box on Yt where you post to the feed there are two buttons. one is the emote / keybd button depending what you are viewing at that second and another is a box with a $ in it. Before that becomes active you have to add a CC to your YT account to be able to use it.
I know ever since they went to a multiplatform feed for these the alerts in you tube either never show up, show up as a dot next to the channel on your home page or a few days later when they post the edited version of the stream. I rarely get lucky enough to catch them live since they started doing this.
Which is why I have asked MULTIPLE times in the FTCA thread that they take 2 seconds after setting up the feed and drop the live link there.