Once you register for Snap Preview AnywhereTM you receive a code which you need to add to your template.
Within this code is a
key= followed by a 32-character key. e.g. on this blog, the 32-character key is
This key is unique to your site and hence you need to register separately for each of your sites.
Once you get the 32-bit key you will need to enter this into the Options page in WP-Admin.