Authentication en Preferences with LDAP

Hi,
I am trying to setup Horde with LDAP Authentication and Preferences of the
users en groups stored in LDAP. When I follow the documentation under
http://wiki.horde.org/NewLDAPHowTo I don't find the part about to setup 
Horde Configuration - Groups.
When I go to the Admin Page under horde to configure groups I only see (See 
pc LDAP1.gif). Do I miss something??

Thanks and regards,
Wim 

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