first and try to find a channel that is related to that usig the search feature after click Channels. I'm not sure that you'll find many channels related to that, but there's probably something out there.
Once you find something, look for the network name and the channel name. You can then ask us with that information and we'll be able to give a specific answer.
In general, you can either start mIRC and go into the network listing in options and connect to a channel from there, or just type: /server irc.servername.net
to connect to a network/server. Example: /server irc.undernet.org
From there, you can join a channel using: /join #channelname
. Example: /join #help