Xbian won't find SSID *NO INTERNET*

[udo.christ]

Is there any chance to tell Xbian that it is ok to use other wifi-channels? Im located in EUROPE and i need to be able to scan channels which are not allowed to us in the US.
Usually i can set the WIFI Area/CountryCode so my WIFI is found. There seems to be no place in XBian where i can do so.
i dont even understand how edit it using the command line. usually i simply change the wpa_supplicant.conf with a text editor, but it seems debian is not normally using this config?

Any ideas?