AdiIRC

Hi,
could you suggest me a server and channel to join in UK or USA?
which server should I joing,
what are the largest channels?

When I try to enter EFEnet server I get this msg:
[20:11:36] * You got MODE +i
[20:11:36] > CTCP VERSION from colodrone
[20:11:39] * Got external host: 190.232.240.57 (EB-00000)
[20:13:17] * You are not on a channel, try /join #channel
[20:13:24] * LIST Server load is temporarily too heavy. Please wait a while and try again.

So can't get the list of channels, why is that happening?

or when I tried to enter to freenode this happened..
[19:39:25] * Looking up chat.freenode.net..
[19:39:25] * Connecting to chat.freenode.net(192.186.157.43) port 6667..
[19:39:25] tepper.freenode.net * Looking up your hostname...
[19:39:25] tepper.freenode.net Checking Ident
[19:39:25] tepper.freenode.net Couldn't look up your hostname
[19:39:34] tepper.freenode.net No Ident response
[19:39:34] tepper.freenode.net ** Notice -- You need to identify via SASL to use this server
[19:39:35] * Closing Link: 190.232.240.57 (SASL access only)

I searched about it here...
https://freenode.net/kb/answer/registration

and it seems that I need a register a Nickserv, but how I do that???

they say I have to send a msg to register like this...
/msg nickserv REGISTER password [email]
but how can I send that msg to the freenode server if I'm not connected in first place???

thanks advanced.