Hi,
In order to configure AD integration with the ASA connector, you would have to deploy the Context Directory Agent software and integrate it with the ASA.
For more information on this, you can go to http://www.cisco.com/c/en/us/td/docs/security/ibf/cda_10/Install_Config_guide/cda10/cda_install.html
In order to check the ASA connector configuration, you can go to http://www.cisco.com/c/en/us/td/docs/security/asa/asa91/configuration/firewall/asa_91_firewall_config/protect_cloud_web_security.html
Thanks & Regards,
Kush Srivastava
Cisco PDI Helpdesk
http://www.cisco.com/go/pdihelpdesk