Rogue WiFi Network

Jow do I get a network ('globalthermalnuclearwar') disconnected? it is checked in my airport.

Answer

First disconnect from the wireless network in question by joining another wireless network or by turning Airport off. Then, in network settings, Airport, you'll find a 'Preferred Networks' list. Remove the unwanted network from the list. Your Mac will only automatically join networks that remain in this list. Further any new networks you join may be added to this list.