If you need Chinese character input in KDE (typing in pinyin and then selecting the correct word), it’s quite simple on Debian GNU/Linux:
apt-get install task-chinese-s-kde-desktop fcitx-pinyin
That’s all there is to it. Afterwards you should be able to start fcitx in KDE and you get a new icon in your system tray. Go there to configure your input methods. By default, ctrl-space will switch to another input method, if you don’t have anything else installed, that will be pinyin input. Ctrl-space again will take you back to one of your previous input methods.