To share your screen during a session all you need to do is click the screen share icon from within a recording studio:
From here you can select whether to share Your Entire Screen, a specific Application Window or a Chrome Tab.
You can also select Share audio which will both share and record audio for the selected source.
(For PC users, you can share audio with the entire screen as well as a Chrome tab. For Mac users, you are only able to share audio with a specific Chrome tab)
Click the share button and your screen will now be shared.
In order to download the screen share separately, please make sure the Separate tracks option is selected in your recording settings.