Context Menu HOWTO :

Notepad++ context menu is the menu appears as right clicking on the edit zone :

User can change the context menu by adding/ modifying the file %APPDATA%\Notepad++\contextMenu.xml.

The rule is very simple : find the id (2) of menu item you want to add from english.xml (All items under the <Commands> tag, you can locate it by its name attribute (1)), then add (or delete) it in (or from) your contextMenu.xml under the form <Item id="idToAdd">. You may notice that id 0 means just a separator in the context menu.