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somewhere on the panel where it does not contain any items and select Add to Panel → Application from the menu that pops up. A copy of the whole K menu pops up. Find the application whose icon you want to add to the panel and select it, just as if you wanted to start it. KDE will then add the icon for this application to the panel. You can even add submenus to the panel by selecting the first menu entry (Add This Menu) in a submenu in the Add → Button tree. The icon will then have a small black arrow in it, which indicates that clicking the icon opens a menu instead of starting an application.

There are other things besides application starter buttons that you can add to the panel as well: for example, panel applets, small programs that are designed to run inside the panel and cannot run as standalones. Just explore the Add to Panel submenus, and you will find many interesting things.

There is only limited space on the panel, so you might need to remove some icons of programs that you do not often use. Just click with the right mouse button on the icon and select the Remove menu item (they will be called different things depending on what you are trying to remove). This does not remove the program, just its icon. In general, you can get at a lot of functionality in KDE by clicking the right mouse button!

The KDE Control Center

Next, we will show you how to configure your KDE desktop to your tastes. As promised, we will not edit any configuration files to do this.

Configuration is done in the KDE Control Center, which you can start from the K menu. (On some distributions, the Control Center is at the top level of the K menu; in others, such as Debian, it is in a submenu such as Settings.) Configuration options are grouped into different types of operations. When you start up the Control Center, you will see the top-level groups. By clicking the plus signs, you can open a group to see the entries in this group.

Configuring the background. As an example, we will now change the background color to something else. To do this, open the Appearance & Themes group and choose Background. The configuration window for configuring the background will appear (see Figure 3-2).

Figure 3-2. Configuring the background of the KDE desktop

You can select a single-colored background, a two-colored background with a number of gradients where one color is slowly morphed into another, a wallpaper (predefined or an image of your own choice), or a blending effect that combines various choices. To select colors, click on either of the two color buttons; a color selection dialog pops up where you can select a color to your taste. When you close the color selection dialog, the new color is displayed in the monitor in the upper-right corner of the configuration window. When you configure KDE, you often see such monitors that allow you to preview your choice. However, you also have the option to see what your choice looks like when in full use. Simply click the Apply button at the lower border of the configuration window, and your change is automatically applied. There is no need to restart the desktop. If you do not see any changes in the monitor, check whether the Picture option is checked. If that is the case, the selected picture will overlay your background color selection in some modes (such as Scaled, which resizes the selected picture to fill the whole background). But try selecting a picture and then experiment with the blending effects to get a combination of background colors (possibly with gradients) and your picture.

If all you want is a monocolored background, select "No picture" in the Background group, and Colors: Single Color in the Options group. You will see that the second color button is grayed out then. Select the color you want with the first color button.

If you want a background picture, but cannot find a suitable one among either your own or the ones provided with your distribution, click the Get New Wallpapers button and you will get a huge list of wallpapers that have been contributed by KDE users; there