How to move icons/components/widgets on KDE4 panel
You can move panel components like start menu button, task bar, pager, system tray, clock and other widgets on the panel and rearrange them to suit your needs. The same can be done not only on the main panel of KDE4 but also with any new panel that you might have created. Follow these steps to do it.
Click on the far right plasma button to open panel settings.
Now move the mouse cursor back on to the panel and drag which ever widget you want to move. Typically whenever a widget become movable, it shows four-arrowed image on the widget. Then just drag the widget.