Follow these steps:
1. Create a user account, server being irc.freenode.net
2. To register, message /msg NickServ REGISTER
3. For help on commands, message /msg NickServ help
4. After registration, one would receive an email for verfication
5. Message the verification code, eg: /msg NickServ VERIFY REGISTER
6. Upon verification, one can fetch the rooms listed upon server and join in.