1 - Go to your Presentation
In step 4 of 'create a session' (Presentation box), click on the preentation you created
2 - Click on Add Page
3 - Create a New Page
4 - Add a video or a ressource link
If your video is available on a streaming website (Youtube, Vimeo, ...), copy and paste the link in "Add a video"
If your video is available online but on a intranet or on a website, use the ressource link section at the bottom of the page.