Print-o-Matic

I’m pretty tech savvy but there is no clear step-by-step instructions on how to use this plugin.

I just want the little printer button to print only the image in this page: http://96.125.172.23/~petden/wp-admin/post.php?post=742&action=edit&message=1

Here’s my code: [print-me target=”.single-image”]
<center><img class=”single-image size-full wp-image-743 alignnone” alt=”printable” src=”http://96.125.172.23/~petden/wp-content/uploads/printable.png&#8221; width=”600″ height=”382″ /></center>