When you start a stream, i.e. go live, it will be visible to everyone – provided that they join the stream. If someone accesses your profile, the banner “is currently live” will appear there.
Let your fans know when you go live by sending them a message with the time and topic of the stream.
To do this, open your profile > Your fans > “Send your fans a message.” And make sure the good news is less than 250 characters.