Advanced Configuration Guide

 Visit Central Administration of SharePoint, click "Manage Web Application” under
“Application Management”.
 Click the website to be configured, and choose SharePoint-80 (as shown below). Then
the “WebPDF Reader Settings” option in the toolbar will be activated, click it. (Note:
Configuration to the administrator’s website is not supported. Therefore, the “WebPDF
Reader Settings” option will not be activated if you choose “SharePoint Central
Administration v4”)
You will enter the configuration page as shown below: