Here's a simple how-to on restarting services in KDE. I will be alluding to this article in other guides on this site, rather than repeating myself every time - Lazy organisation, I call it :)
- Click on KMenu and select System settings.
- Select the Advanced tab and click on System services.
- Click on the administrator mode button and enter your superuser password.
- In the huge list of services on the left, navigate to the service you would like to restart.