If you've bought the Magic Pass during the pre-season, you have access to the Santa approved nice list certificate for your recipients! This will last until November 20th, 2017.
In order to print out a nice list certificate, you'll need to have at least one recipient in your account. You can make a recipient by making a video for them.
You'll need to go to My Account, find the recipient you want to save a certificate for, and select 'Download Certificate'. You should then get a message/pop up about saving the file. Now that you have the file, all you need to do is print it off.