I'm not entirely sure I understand the question. Are you perhaps talking about "The Human Eye" course?If so, the button was created with the button wizard. If you click the "edit" button to the far right of image normal state, it will re-open the button wizard and you can change the button to read whatever you want. The button, however, doesn't actually print. The print functionality is on the page with the certificate. It's simply an action of On Show> Print Current Page.Hope this helps.
