Go to Firebase console (http://console.firebase.google.com/) navigate to your application, and under the authentication tab, enable email/pass authentication. This is your sign-up activity. It has two EditTexts, a TextView, a Button and a Progress Bar.
Read moreHow do I authorize Firebase?
To authenticate a service account and authorize it to access Firebase services, you must generate a private key file in JSON format . To generate a private key file for your service account: In the Firebase console, open Settings > Service Accounts. Click Generate New Private Key, then confirm by clicking Generate Key.
Read moreHow do I enable Firebase authentication?
Using Firebase Authentication, we will authenticate the log-in of Google, Facebook, GitHub, Twitter and more.
Read more