I see... hmmm.. I know next to nothing about Dockbarx configuration...
The preferences dialog of DockbarX can be found from your applications menu or (if you use DockX or mate-/xfce-/gnome-applet) by right clicking and choosing Preferences.
Does that feature work and bring up a dialog that helps?
EDIT: another one:
You can access the configuration window from "XFCE menu > Accessories > DockbarX Preference".