I want to create a lesson, with no quiz, so I suppose that is type "Theory." I try to put something in the text box, but I get the message I need to create a "slide." Why? What is the text box for? Supposedly the slide can be text or video. I embed a video from youtube. The text format is set to HTML so that should work. But it does not work. The slide just contains HTML code. Okay, how do I edit the slide? And how do I embed a video?