The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.
http://click.email.greatschools.org/?qs=1c7fb64836abe887accd91e496c7774b85222fdd0dfd7c787d0b5b480b7dfaf1dbb3416d829bf2535cac34865b1e3b29f729538ac3ff69bf