How to Enable Chat for Google Plus Circles

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Screenshot Courtesy, ©2011 Google

In addition to adding and inviting people to chat one-by-one, Google Plus users can also enable an entire Circle of contacts at once using the Chat settings.

Click the drop-down menu arrow at the top of the Chat feature, and select "Circles." A window will appear with all the Circles you have created. By checking the check box next to each, you allow those persons to be added to your buddy list, and to send and receive IMs with you.

Once you have selected all the Circles you wish to be able to chat with, click the blue "Enable Chat" button. To remove a Circle from having Chat access with you, simply follow the steps above, de-selecting the Circle before clicking "Enable Chat."

Source: http://im.about.com/od/im-clients/ss/how-to-use-google-plus-chat_6.htm