The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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=1c7fb64836abe887c1d69ff3b49e9fe5350006c595f558258607c755abcb7a0263f3fb756748538740fa05911488d7f6f0a8417e21422cfc