When you get the "not connected to server" message it's because you've tried to type in a command other than /server blahblahblah...
Try a server that you
know for sure that works
/server irc.phazenet.com
/server amsterdam2.nl.eu.undernet.org
/server irc.cl
i've tried all of them, and none of them has failed to connect so far.
come back with the results