Comment # 4 on bug 1012824 from Wolfgang Bauer

Click on the "settings" button in the top-right corner of plasma-nm's popup
(i.e. when you left-click on the icon in the system tray) and you will get
KDE's connection editor, where you can also modify existing connections.

Sorry, not a bug.

And not a new change either. That's how things work in the "new" plasma-nm that
replaced the old plasmoid-networkmanagement in openSUSE 13.2 (and already was
available in 13.1 as "technological preview", just not installed by default).