Follow the given procedure to remove contact(s)/group from the list of contacts:
Open the Address Book screen.
Select the contact(s)/group that you want to remove from the list by ticking the checkbox beside each contact/group.
Click [Delete] button. A warning message appears.
Click OK and the selected contact/group is removed from the list.
Accessing & Understanding Address Book Screen
Adding New Contact
Creating a New Group
Importing and Exporting Contacts