To remove a contact from a group, perform the following steps:
Select the group from which you want to remove the contact.
A tab appears that lists all the contacts in the selected group.
Right-click on the contact and select Remove From Group from the context menu.
Click the Manage Group icon from the address book toolbar.
The contacts in the group are displayed in a tab.
Uncheck the check box next to the contact that you want to remove from the group.
To remove all contacts from the group, select the check box All at the bottom of the pane.
Click Save Changes.
Click Remove from Group icon from the address book toolbar.
The selected contacts are removed from the group.