Members can’t create their own chars. Instead they can assign existing characters to themselves. To do this you have to enable the RaidPlanner plugin in the joomla administration interface. (Extension / Plugin Manager search for User type plugins, and enable User – RaidPlanner Plugin)
This plugin adds 3 fields to user profiles:
Characters, Calendar secret, Vacation
Characters can be inserted in the Administration interface (or can be downloaded from WoW Armory), and users can enter their own character to the Characters field, which will automatically links the character(s) to the user. (check: http://taracque.hu/raidplanner/faq/#joomla_16_char_assign )