You can't, I just woke up trying to print a Big Lots 20% coupon from PDF reader...the only way is if your printer has it's own e-mail address you can share to it by e-mailing it to print.
I found a solution, go to your settings in WiFi and connect to your printer like it's a wireless router. Now go to what you want to print and share to email, send the email to your printer's email address and it will print.