How do you use IRC?

Answer 1

You must download an irc client, or use a web based one, then you must select an irc network, ex IRC://irc.example.com (the client often leaves out IRC:// since all irc channels would use it, so you may just need to type, irc.example.com) and then join a channel (ex: #example) use the "/join #example" command, all channels start with #.

Answer 2

Here's a real quick question for you before I answer this: On what IRC network? Some networks do not provide services for registration of channels/nicknames/etc... such as EFNet. If you are using a network with NickServ you would type /msg NickServ register <password> <email>