
Adding Plasmoids (also called Widgets) is done from the desktop.
Find the button in the upper right corner of your desktop and -click it to bring up a menu.
Select Add Widgets... to bring up a list of Widgets.
From here, select the desired Widget.
To install a new Widget, button on the upper right corner of the Widgets window.
-click theSelect Download New Plasma Widgets or Install Widget From Local File..., and follow the on-screen instructions from there.