Try opening up KWiFiManager, => settings => configure. Enter in the information on network name, etc. Hit ACitvate and Autodetect, close this screen. Go to the K-Menu => Utilities => Terminal type in su - [unless you have a superuser password] then type in pump -i [nic-device, for example ath0], type exit and press Enter (return) your IP should show up in the KWiFiManager window and you should be connected.