Firebase Authentication Custom Authentication

Issue

I'm using Android Studio to create an App where is possible for users to get registered and to log in. To do that I want to use Firebase Authentication, so I clicked on the "Tool" section in android studio, and then on "Firebase". I selected "Authentication" from the menu and among the possible choices i choose "Custum Authentication System". It was then told me to follow the steps that you can find here under the section "Before you begin". I followed everything and I donwloaded the json file containing my account's public/private key pair (point number 2, letter c) but I have no clue where I have to copy it. The istructions say "Copy this file to your authentication server" but I don't have an Authentication server, I wanted to do everything through Firebase. Can someone help me and tell me where I have to copy this file, or if there's a way I can implement the Authentication system only using Firebase and no other external server?

-- EDIT --

For anyone interested, I figured it out thanks to a tutorial on youtube. Simply ignore the passage (point number 2, letter c) and click on "Set Login method" on Firebase in the section Authentication. Choose the "email and password" method, and that's it. Everything will be done through Firebase.

Solution

For anyone interested, I figured it out thanks to a tutorial on youtube. Simply ignore the passage (point number 2, letter c) and click on "Set Login method" on Firebase in the section Authentication. Choose the "email and password" method, and that's it. Everything will be done through Firebase.

Answered By - G_S