1. Open application System Preferences.

2. Click Internet Accounts.

3. On right panel, click Add Other Account at the bottom.

4. Choose Add a CardDAV account in popup window.

5. Fill up the form with your server address and email account credential

User Name: Your full email address.

Password: Password of your email account.

Server Address: https://[server name or IP address]/SOGo/dav/[your full email address]