You can choose 'open mode' or 'invite only' for your guest space once you start your broadcast. Please click 'guest setting' button on the right beside chat button. Anyone can join as a guest in the open mode, but in the invite only mode, only the people you send an invite can be a guest in your broadcast. You can send an invite to your audiences from your audience list. Click the person icon next to your profile to see your audiences and send an invite to join as a guest!