The lesson uses mobGUI which is a 3rd party addon. The info on the screen with the video player has a link to where you can get a trial. When using mobGUI, its objects are groups, so adding the browser stuff from mobgui adds a group to the app. You interact with the mobgui scripts by setting properties.
Make sure you've done all the required stuff (get mobui, install the library in your app etc)
Also, there is a forum category for the business academy, if you don't see it in the list, and you paid for the academy you can email
support@runrev.com from the email you used to register for everything and ask if they can give access.