Hi
Please elaborate a bit more as you want users to download pdf from your site or print site page as pdf etc
If its regarding documents then you can add add df documents in your site and then link them to pages where users can download the pdf, if you are referring to print page then you can provide information for ctrl+p/cmd+p , or add html code for print shortcut.
https://forums.adobe.com/message/6319543
Thanks,
Sanjit