Can you remind me how to do this?
Go into the control panel, to manage Members.
Scroll down to Circle, and choose one from the pull-down menu, then click Search.
On the resulting page choose the members that you want to email, or click Select All from the top. Then from the pull-down menu at the bottom of the results page select Notify Member(s), then you'll get an email form where you can put in your subject and the body of the email.
Thank you! I thought they also had a group but I can't seem to find it.
You can also see the group list on the same search page.