NickServ is the network service responsible for keeping track of who nicknames belong to.
Before you can register channels with Chanserv or send memos with MemoServ, you will need a registered nickname. Some channel modes will also prevent unregistered nicknames from joining or communicating in a channel.
Users are encouraged to make use of the NickServ HELP command by typing the following syntax:
/msg NickServ HELP
If you need further help with the commands, see Nickserv Commands.