To Manage Address book in Horde Interfac, Please follow the screen shots steps:
1) Open http://webmail.yourdomainname.com and Enter Login information :

2) Expand the Organizing > Then expand the Address Book and Click New Contact

3) Fill all fields as shown the screen shot.

4) Click ADD.
![GRABWEB [India] GRABWEB [India]](/templates/lagom2/assets/img/logo/logo_big.1453680117.png)