Step 1: locate the address book icon at the bottom of your desktop.
Step 2: click on the address book icon.
Step 3: select Preferences from the Address Book menu.
Step 4: on the accounts window select the Account Information tab. Then click in the plus symbol located at the bottom left to add a new account.
Step 5: select CardDAV. For User Name enter your account name, followed by the domain name in parenthesis. For example, if your full email address is firstname.lastname@example.org, then enter testaccount, followed by (fastmetrics.com). Enter your email Password. The Server Address must be mail.fastmetrics.com:80. Be sure to include “:80” at the end – otherwise an error will occur. Then click Create.
Step 6: your account is now set up. You may close the accounts window.