Click File ▸ New ▸ Contact, or right-click in a blank space in the list of contacts and click New Contact…, or press Shift+Ctrl+C.
Select the address book under Where: to which it will be added.
Enter the contact information. Note that there are several tabs.
You can add a photograph to the contact by clicking the large field (showing a stylized person) next to Full Name and Categories.
Click OK.
You can also add a contact directly from an email.
Right-click on the email address in the message header.
Select Add to Address Book….
Either press Edit Full to bring up the full Contact Editor, or click OK to directly add the contact to the chosen address book.
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