[xwiki-users] XWiki User / Rights Administration ??

Hi, We've just installed XWiki and feel User Rights and Group administration is somewhat cumbersome in the basic install package. XWiki.org website indicate that a far more advanced user- and group admin system is available than the one natively available in XWiki 1.1.2.5797: http://platform.xwiki.org/xwiki/bin/view/Features/RightsManagement#HAdd2Crem ove2Ceditusersandgroups22onthefly22 How can we enable this functionality? Best regards, Robert