Facebook Plugin V1.7.0

I'm new to Grav; I installed the Facebook plugin and configured it, but now I don't know how to get the feed on a page ... ? The Github doc states " You simply need to include a function your template file such as: {{ facebook_posts() }}"

What template file? Where? It's be great to have a step-by-step ... thanks

It's up to you. You insert the code provided into the Twig of either a specific page or in a template file for multiple pages.

Docs on theme customization

Docs on content in Grav

Any examples, I've placed it on specific pages with Twig enabled and I just get an error message, or nothing at all

What's the error message?