When manually installing applications in Lubuntu / Linux menu items are not often not created/added. Fortunately the process for Lubuntu is simple.

To add a menu item in LXDE simply add a desktop entry to ~/.local/share/applications/. Here’s a sample desktop file I created for Charles Web Debugging Proxy.

[Desktop Entry]
Name=Charles Debugger
Exec=/usr/local/charles/bin/charles
Comment=
Icon=/usr/local/charles/icon/charles_icon128.png
NoDisplay=false
Categories=Development;
Type=Application

More information on Desktop Entry files can be found here.