how mto join room

open pidgin/gaim
create a new account, select irc, give yourself screen name, server should be auto populated, create password if you wish. click add. when it connects and new windows will pop with bar at bottom to type in. just type "/join #ubuntu "
type the above without "

that should be it.

also checkout http://www.irchelp.org/irchelp/new2irc.html and https://help.ubuntu.com/community/InternetRelayChat

I can't make join room,
on the gaim menu there's ROOM LIST tab, and I try to join room with pick one of room that listed in the room list.
And then I click JOIN tab, but I can't join the room.
What I mean is not to chat with my friend which was in my listed, but another people.
please tell me step by step to make join room on room list.

Appreciate your previous answer Terry

open pidgin if you are using ubuntu gutsy and above has this replaced gaim

application-internet-pidgin

should get buddylist with options at the top.

click accounts then add/edit
new window will open called account listing all of your accounts
click add
get add account window
under protocol select irc
under screen name try and think of something unique.
server field should be auto populated with irc.ubuntu.com (if not type it in)
password field type a password of your choosing.
click remember password to add tick
click save
after couple of seconds a freenode-connect window should appear
the text space under font and insert type "/join #ubuntu" (without "")
2 new tabs should appear in the same window called #ubuntu and #Chanserv
click #ubuntu
you are now in the room and can start using/talking on it.

ubuntu