In order to make it as easy as possible, the KDE System Settings has organized options into five categories. Under each category, there are icons grouped together under subcategories. Each icon is called a module. When you click on a module icon, you will be presented with the options of the module in the main window.
Each module will have some or all of the following buttons:
This button will provide help specific to the current module. Clicking the button will open KHelpCenter in a new window providing detailed information on the module.
Clicking this button will restore this module to its default values. You must click to save the options.
This button will "Reset" the module to the previous settings.
Clicking this button will save all changes to KDE. If you have changed anything, clicking will cause the changes to take effect.
You must either "Reset" or "Apply" the any changes before changing to another module.
If you try to change without saving or resetting your options, you will be asked if you want to save your changes, or discard them.