Restrict to logged-in users only

Hi there.

I have just found your Print Friendly button for WordPress – and I think it’s lovely. So much nicer than the one that I was using.

However, there is one thing that I can’t find (I’m not a techie by any means).
Is there any way to configure it so that the user must be logged in (registered) in order to download the page or post to a PDF, please?

I’m trying to find a way to make people sign up (my site is very new) and thought that would be a good idea.

I looked through as many pages as I an to see if the topic had already been brought up, but I couldn’t see it.

https://wordpress.org/plugins/printfriendly/