You can activate the application menu by clicking the mouse's center button (or wheel) or double-clicking on the floating icon. Make the menu rotate using your mouse wheel or the up-and-down arrows on your keyboard.
To place a shortcut in one of the boxes, just drag it from one place to another. Right-click on any box to select the type of shortcut you want to place there: program, website, local folder, etc.
Krento lets you create more than one circular menu and load in whatever you want from the application's menu. You can also change the appearance of the circular menu from the program options.