networkmanager and knetworkmanager
If I remember correctly,
go to Yast, network devices, select your network interface (ethernet card, wifi..) and then edit. In the "general" tab you will find options to set your network device to start at boot, hotplug, etc.
THen - right click on your taskbar, choose add application to panel...system...desktop applet...knetworkmanager.
when you reboot, NetworkManager should start (if you chose "at boot") and Knetworkmanager should be running on your taskbar.