Join and leave an IM group
Select Menu > Applications > IM > IM groups.
IM groups are only available if supported by the service provider.
To join an IM group, select it, and enter your screen name. To join an IM group not
on the list, but whose group ID you know, select Options > Join new group, and
enter the group ID.
To leave the IM group, select Options > Leave IM group.