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To manage your chatters, click the "Manage Chatrooms" tab, and then select the type of user that you want to edit for the room you wish to manage.
For example, if you click "Operators," you'll be presented with a screen that allows you to type in the username(s) of the person(s) you wish to add as operator(s). You can also change the settings for this access level, and decide if you want them to be able to use certain features in the chat. You'll need to first unclick the default button to control the individual settings.
Don't forget, that if you want to operate in your own channel, you'll need to add your own username in the Operators Access category.
You can also remove a person from the access category by clicking "remove" by their name.