Copy-and-paste this code into your HTML where you would like PrintFriendly to appear.
For custom placement, add code directly to template.
<data:post.body/'>and Save Template.
<div class='post-footer'>tag, and Save Template.
From the Dashboard, click "Settings", then click "Sharing".
In the popup window, enter...
Left-Click (and hold) the new Print & PDF button. Drag to "Enabled Services", and release the mouse button. Don't forget to save!