To join a broadcast you must first be invited by the host of the broadcast and have created a Socialive account.
Once your account is created you can download the SocialiveGo App from the App Store and log into the newly created guest account on your mobile device.
Once logged in, you can join either by clicking the link in the email or by opening the app directly and clicking the "join broadcast" button.
Once you've joined your host's broadcast your feed will be displayed as a Live Source on their end. There will be a GREEN wireframe displayed around the border of your phone's screen indicating that you are not "on screen" which will change to a RED wireframe when your source is being broadcasted.