Once the cone or rod has been placed in the interior portion of the kiln sitter, the sitter must be still be armed in order for the kiln to function.
Double check that the plate is held by the latch on the extreior panel. Once the kiln has been loaded and you are ready to begin firing, push the button that is now inset in the open area of the plate. This will close the electrical circuits, allowing electricity to flow into the kiln's switches or controller. The kiln sitter is now armed and ready for firing.