Double-click the contact's address card to change details.
Right-click a contact, then click Delete; or select a contact, then click Delete on the toolbar.
Right-click a contact, then click Send Message to Contact.
Double-click in any blank space in the contact manager to create a new address card, or right-click anywhere in the address book and select New Contact. You can also click File > New Contact or press Ctrl+Shift+C.