Primeiro clique em DuckDuckGo: wiki.lxde.org/en/Main_Menu
The Menu-plugin is part of the LXPanel and follows the standards of freedesktop.org. The Menu-plugin does not provide graphical editing of the menu itself therefore external tools should be used.
The PCManFM can be used now to edit menu - since version 1.2.0 all the menu editing opearations are supported in Applications folder, except for separators (being a file manager, PCManFM shows only folders and applications, ignoring any separators).
The Alacarte is well known menu editor from GNOME project written in Python.
One can download and compile LXMED, a menu editor for LXDE written in Java, which requires GKSU.