Product Theme Menus

I can’t get the menus to work. Under “appearance”, “menus” it says the theme only supports 1 menu, yet I’ve seen multiple menus on the demo video. I created an ‘About Us’ menu that showed up and worked. Then I created a “Blog” menu. When I went to the page, it was not in the place where “About Us” was located and the “About Us” was gone. Frustrating….but I need this to work or the them is useless to me.