Groups are a way to categorize your contacts to efficiently filter them in the address book display.  This is helpful for focusing on one group of your contacts for locating a contact or for sending out promotional materials.

Contacts can be members of multiple groups giving you the maximum flexibility in organization.

To assign a contact to a group: 

Select a contact and click on the Groups tab and click on a group.  The line will change to a blue with white type indicating that it is selected.  To un-assign a contact from a group click on the group again and the line and text color will return to normal.

You can also find a set of contacts in the address book window and use the Assign To Group button.  This action will assign all the contacts displayed to a group that you select or create in the assign to group window.

Lastly you can assign contacts being imported to a group as they are imported.  Upon vCard import, you will be prompted if you want to assign the incoming contacts import to an existing group. Select an existing group from the menu or enter a group name in the New group name field.

In Blinkbid 4.02 you only had a choice of a Primary or Secondary mailing list group.  These setting will remain consistent in the upgrade to a later version.  But now you can rename those 4.02 groups in the adding and editing groups section.