If you have guest broadcasting enabled, check your "Guest" tab to see who is in queue to join your broadcast. Hover over the user you want to choose and then click the "Make guest" option. That user will then join your broadcast.
To end your guest's broadcast, click "Drop."
If you would like to invite a user to be your guest, click on that person's username in the chat or your "Audience" tab, and you’ll see a “Guest” option on their mini-profile.
Note that hosting is only available on web and does not work with Safari and Internet Explorer. You may, however, join broadcasts as a guest on the app.