See the Tiki Manager link in the admin menu (tiki-ajax_services.php?controller=manager&action=index). This is the full back-end interface
Tracker field
Tiki Manager Tracker Field is for when you want to have meta data associated to your instances, or if you want to launch Tiki instances from Tracker items.
Wiki Plugin
PluginTikiManager is for when you want to present a simple user interface, with a subset of functionality.