Adding contacts to your Mac address book:

1. Open your computer's Address Book (Applications > Address Book)
2. Under Groups column, click on the (+) button to create a new group if needed (Optional - for example: Family Contacts, Business Contacts)
3. Under Name column, click on the (+) button to create a new contact
4. Enter the contact information
5. Repeat the steps until all of the contacts are entered,
6. from the File menu click on Save

(You can add an email address to your address book from a message by clicking Command-Shift-Y. )