Before I get into using the tool, here is a list of tips I would consider when preparing your Blogger site for Printfriendly:
TIPS1. Add a Heading above your text. Print friend does not seem to recognize your titles. So you may have to add an extra heading above each post. Here is how you change text to a heading:
2. Treat each post as newsletter information. So things like including links into your post. The readers need to be able to see the entire address in order to utilize it. For example: www.biguniverse.com
4. Find out from parents how many actually need a paper version. They have access to the website. Why send repeated information if they do not need it? Have parents opt-in on newsletters.
Here is how to use Printfriendly in more detail: