adding identities

==== Required information ====
- iRedMail version:0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Linux/BSD distribution name and version: Centos 6 64bit
- Related log if you're reporting an issue:
====

I noticed that the ability to add identities for a user is greyed-out or missing.  Is this because of mysql, or just disabled by default... and how would one enable or add identities?

Thank you... Otherwise I am loving this product so far!