There isn’t any intuitive way to figure out you need to create items, to add to courses (that need to be created) that are added to menus. Without reading how to use the plugin you go in circles getting frustrated. I build sites all day every day for a living, I almost never have to read a step by step, the plugins I use and purchase for my clients over and over again are generally easy to figure out, and if I can’t figure them out by looking at them then I know my clients won’t ever figure them out and I move on. The experienced WP user could just format regular text in the content edit window to match the look of your menu faster than they could figure how to manage the plugin then create something out of it.
Perhaps a huge step forward would be to get rid of having to type out the menu sections like tags to add something to them, perhaps instead have a list of the already created sections (like categories instead of tags) that the user can check mark, that at the very least, will make it somewhat intuitive that the user needs to create 1 part, then add that part to a second part, etc…
Just my 2 cents. ??