In order to print coupons you need to install special "coupon printer" software on your computer. Before doing so you must set your default printer to an actual real-life printer in your home. The software will not allow you to print to any type of PDF printer. Trust me, I've tried. I know you may be tempted to try too. Go ahead. When it gives you a message saying it can't print, and provides all sorts of convoluted directions to fix it, at that point just change it back to a real printer and it should be fine.
There are about 4 major sources for printable coupons on the internet. Each will require you to install their own specific coupon printer software. It is a bit of a pain, but the good news is that you only have to do it the first time you try to print coupons for each of the 4 sites.
Where do you get the software? After you select your batch of coupons, each site will check to see if they are able to be printed. If it's your first time on that site it will automatically prompt you to download and install the software. It's quite easy. You can do it! I have faith in you.