Restart KDE
From MEPIS Documentation Wiki
Save all the open files and close all open programs.
You can restart KDE the 'quick and dirty' way by pressing the CTRL-ALT-BACKSPACE key combination. This may not kill all KDE processes but you will initiate a new session (X and KDE)- you could log out first - this will retain your session state if you use that option.
To restart KDE (and X) from a console, log in as root and type:
/etc/init.d/kdm restart