Group Address
Your Group Address is the email address people use to send messages to your group. You can choose who can send to your group in the group Settings.
You can set up a custom domain which will allow you to use any address for your group, however, you will always have a Group Address which will be a @gaggle.email address and cannot be changed once your group has been created.
Your Group Name can be changed at any time from the Design tab of your group dashboard.