The Groups interface allows you to create mailing lists, or "groups", to send your newsletters to. Announcer can support multiple groups, and more than one group can be assigned to a newsletter (campaign).
To create a new group, click on the "add" button at the top of the "existing groups" list. Next, enter a name for the group on the right. Then click "apply". You can repeat this process to create multiple groups. Please note that you are only setting up group names; you can enter in contacts for each group in the Contacts interface.
To delete a group, click the deletion icon beside the group you want to delete. Please note that you can only delete groups which have no contacts, or have had all contacts deleted from it.
To edit a group's name, click the inspection icon beside the group that you want to change. When the name appears on the right, enter a new name and click "apply".