I now want to install an app launch in my start menu. I did this by This installed the app launcher in my menu://applications/Internet directory (although it was a hidden app so I had to unhide it).

For this app launcher the target file is "/home/richard/.local/share/applications/electrum.desktop" and the command is "electrum %u"

The only problem is that when I try to launch Electrum in my start menu nothing happens. Where have I gone wrong?