Save to PDF: how to do?

Why when I try to save a file from Rhinoceros to PDF I get a message that tells me that I have a printer connected?
I do not have a printer attached, so how do I export to PDF?

A PDF printer is not included in Rhino - you will need to download and install one yourself if you don’t already have something like Acrobat. There are tons of free ones out there - one that gets recommended often is PDF995