There are a few requirements for setting up Facebook Instant articles on your WordPress site. You need a:
Facebook page for your WordPress website.
Facebook page app (we will show you how to create it later in this article).
At least 10 or more articles on your website.
Instant Articles for WP plugin (We will show you how to set it up later in this article).
Having said that, let's get started by applying for Facebook Instant Articles.
Source: http://www.wpbeginner.com/