How to configure conference room in freepbx2.2.1

i remember there is a menu to configure conference room in older version of freepbx.
Now, i can’t find where i can create a conference room for multi-people talking in freepbx2.2.1.
How to do this in freepbx2.2.1. Any suggestion will be appriciated

i have solved this question.
after install freepbx2.2.1,must check for updates online in “tools–>module admin”, then i can see the conference room menu