How do I "identify with services" on IRC?

How do I "identify with services" on IRC? "I am using irrsi as my irc cilent on ubuntu I have entered ""/join #android-dev"" in my command window. But I am getting this error message:"
Asked by: Guest \| Views: 358

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bert [Entry]

"You must first register your nickname with the nickname-registering services. Try

/msg nickserv help

and register your nickname."