Signup for Instant Articles

The first step is to enable Instant Articles on your Facebook page (if you have not already done so). This grants you access to all the Instant Articles tools you need to get started.

https://www.facebook.com/instant_articles/signup

After signing up you can access the Instant Articles tools for your Facebook Page by going to Publishing Tools at the top of your page, then clicking Configuration under the Instant Articles item in the left hand menu.