When first accessing the "Groups" tab, a list of the existing domains is displayed. To be able to manage the groups you have to first select one of the existing domains.
After selecting a certain domain the list of previously created groups is displayed. To run a search for a specific group use the "Group Search" field.
Group Operations
To edit an existing group use its corresponding "Edit" button, to delete it click the "Delete" button. In order to create a new group, click the "Add Group" button.
The domain you are creating the group in is displayed in the "Domain name" field if you have already selected a certain domain. If you press the "Add Group" button prior to the domain selection you will have to type the desired domain. Specify a name for the group you are creating in the "Group Name" text field. After specifying these two parameters, the group's email address will be displayed (generic address is groupname@domainname.tld).
Check the "Enable this group" option if you want to render the group active. If you are done configuring the group click the "Quick Add" button. Alternatively, should you prefer to further configure it, click the "Advanced Config" link. This link and the "Edit" button, corresponding to a previously created group, gives access to two configuration pages: "General" and "Message Filters".