mattebox on "[Plugin: Instant Articles for WP] Installation steps"

Hello, sorry if my questions maybe are too basic, but I cannot make it work.
Someone can please explain me the correct procedure?
1- I created a facebook app for the website (here I don't know if i have to send the app for review for extra functions or leave it simple like that)
2- I made all the steps of the Instant artciles activation (claim url etc) but i don't understand if "WITH THIS PLUGIN YOU NEED ALSO TO USE THE RSS FEED LINK OR LEAVE BLANK THAT SPACE?
3- How I know this plugin works, I should see ALL the articles of the website like draft in the facebook page instant articles production settings?
4- Any suggestion to see preview of the instant articles version?

TY

https://wordpress.org/plugins/fb-instant-articles/

You can add in the RSS feed into that space.

You'll know if the plugin is working if on the Instant Articles settings page you are able to 'Login with Facebook' (big blue button near top) and choose your Facebook Page to connect.

Many of us have it start the process and never finish it. We're waiting for a fix to come soon.

I logged in from the plugin, it seems it work now, but i did not used rss feed, i will do it manually