How do I remove an old WiFi network
I had an old WiFi Router DSL connection that died. It has been replaced.
However the old network still shows up under the WiFi icon.
If I go to: Settings/Network Name I can select the network but cannot uncheck the 'remeber this network' bow without logging in.
As the network is no longer there I cannot log in.
How do I clear out old settings that do not exist?
iMac (24-inch Mid 2007), OS X Yosemite (10.10.2)