Pinterest Save It Button Widget--How to Install in GP Pro

Hello,

I am trying to install the code from Pinterest for the Save It button. I would like to have the Pinterest Save icon show up in each blog image so that people can click it and save my images to Pinterest.

Pinterest gives the following instructions:

Copy and paste this code into your page where you want your add-on to appear:
<script async defer data-pin-hover="true" data-pin-tall="true" src="//assets.pinterest.com/js/pinit.js"></script>

With that, I can add the code at the bottom of each blog post so that the Pinterest Save It icon appears when someone hovers over an image in that particular blog post.

How can I add the code or some code that will allow me to add the Save It bottom to ALL of my blog posts, not just one post at a time?

Thank you