In this window you can see a preview of the menu structure. Each menu (i.e. the top-level menu bar and the pop-up menus) contains one "placeholder", that is, a blank item which is used to add new menu items. In other words, to add a new item to a menu, simply click on its placeholder element and start typing the new item's text. This will take you to the menu item properties window described below. You can also use your mouse to move (drag & drop) menu items to other locations. Also, most of the options available in the program are accessible from main window's menu.