The menu item Settings->Archieserver selects the server to query for. Please consider the netload and select the nearest servers to you.
TIP: If you want to add a new server supporting archie service, edit in the karchierc file in section [HostConfig] the Hosts= line.
The searchmode gives you the possibility to select the sort of searchstring you have. If for example you are shure to have the right filename then you may select exact.