I'm there 24/7 so if the channel is empty you're definitely on the wrong channel or the wrong server. You should see Gazz, me and a thing called Chanserv.
Next time type /msg nivlac hey! I'm here and that'll send me a message. If I don't respond right away, just minimize (not close) mIRC and look at it again in 15 minutes. It usually doesn't take me long to respond. If I don't respond at all or it tells you I'm not connected then you're most likely on the wrong server.
Also it's not "/connect", it's actually "/server"... I changed the OP to reflect that. So when you open mIRC, close the favorites box and type
/server irc.gamesurge.net 6667
/join #WGT