1. You can add a new menu category or you can create a new menu item within a category. Click in the area where you want add the new menu. If you click on an existing menu, your new menu will be created above it. To create a menu within a menu, you must open it up and click on an item inside.

2. Click on the "New Menu" button to add the new menu.

3. You can use the arrows to place the menu where you want it.

4. Give the menu a name by typing it in the "Label" box.

5. You can use the "Separator" button to add a separation between items.

6. When you create a new menu, a new item is automatically created within the new menu. To add a new item to an existing menu, click on the "New Item" button. A new item is created above a selected item.

7. Give the item a name by typing in the "Label" box. 

8. *Very important*,  type in the run command for the program that you are adding. This is the command that you would normally place in run-box dialog or that you would type into a terminal to open the program. For instance, if you installed Virtualbox, you would write, virtualbox into the execute box. If you installed Blender, you would write, blender into the box. (Note*, make sure that the action menu is set to "Execute". You can create other actions to add to your menu for each program. So for instance, you can create a sub-menu for Program, then have a menu item that starts the program and a second menu item that exits the program.)

9. Use the arrows to move the item up or down.

10. Use the "New separator" button to create a separation, ie to separate categories.

11. And finally and most important, select "File > Save " to save your new menu. The new menu is updated instantly.