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In the Main Edition you add Workspace switcher to the panel.
Then right click and click preferences to get to how many to have.
In the KDE CE
Right Click on the panel and click and Add Applet.
Now add the Desktop and Preview Pager.
Now you should see the Desktops on the panel.
To change the Desktops know just move the mouse over the applet and use the scroll on you mouse to switch them.
Which version do you plan on using?