1.To add a new command to a drop-down or context menu, first locate the menu as explained in Finding a menu in the configuration.
2.Expand the menu you want to add command to, and locate the <l:ShellMenuItem Header="whatever"> line.
3.Make an empty line, and then add a code, as explained in Menus syntax.
4.Save changes.
5.Re-import the XML file as explained in Re-importing configuration file in the database after making changes.
See also
If a modified menu command / shortcut key do not function