Once you’ve found your way to the Stage, hit ‘Go On Stage’ to select your mic audio/video options — don’t worry, the audience can’t see you just yet, but the other organisers can.
Hit ‘Go Live’ to start broadcasting yourself and then ‘Record’ to record. As an organiser, you’ll have a few more options along the bottom of your screen to edit the Stage with the cog wheel or view your ‘Presenters’. From both of these options, you can add presenters on the fly — so it’s nice and easy to bring your attendees on Stage to ask questions.
If you’ve recorded the session, it will appear in the window almost as soon as the Stage has ended — so anyone that missed it can either download it or watch it back in the browser.