How to setup Firebase database for enabling chat in your Dating app?

For obtaining API Key, Auth Domain, Database URL and Storage Bucket follow below mention steps :

Step 1 : Go to Firebase

Step 2 : If you have a Firebase account, Signin, else SignupStep 3 : Click on Get Started Step 4 : Click on Create a ProjectStep 5 : Enter your project name and tick mark the checkbox to accept terms and conditionsStep 6 : Click on ContinueStep 7 : Select "Set up Google Analytics for my project" and click on ContinueStep 8 : Open Configure Google Analytics dropdown menuStep 9 : Choose your Google Analytics account or create a new account, and click on Create ProjectStep 10 : Click on ContinueStep 11 : Click on Add Firebase to your web app Step 12 : Enter App nickname Step 13 : Click on Register appStep 14 : Click on Continue to Console Step 15 : Click on Build menuStep 16 : The Build dropdown menu will open on the left hand side panel, click on AuthenticationStep 17 : Click on Get StartedStep 18 : Click on Anonymous Step 19 : Enable Anonymous Step 20 : Once done, click on Save button Step 21 : In build menu on the left hand side panel, click on Realtime databaseStep 22 : Click on Create database Step 23 : Select Realtime database location by click on dropdown menu and after select click on next Step 24 : Click on Enable Step 25 : Here is your Firebase(Data) url copy it.And Click on Rules 
Note: You can also find the Firebase(Data) URL in step 30. Copy the URL from here if you do not find the URL in step 30.

Step 26 : Delete the entire code 

Step 27 : Now enter the following code, and click on Publish

{
  "rules": {
    ".read": "auth.uid != null",
    ".write": "auth.uid != null"
  }
}