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 Step 6 : Click on Continue
Step 7 : Enable Google Analytics for your project and click on Continue Step 8 : Open Configure Google Analytics dropdown menu
Step 9 : Select the Default Account for Firebase from the dropdown menu or create a new account
Step 10 : Click on Create Project.
Step 11 : Click on ContinueStep 12 : Click on Add Firebase to your web app Step 13 : Enter App nickname Step 14 : Click on Register appStep 15 : Click on Continue to Console Step 16 : Click on Build menuStep 17 : The Build dropdown menu will open on the left hand side panel, click on AuthenticationStep 18 : Click on Get StartedStep 19 : Click on Anonymous Step 20 : Enable Anonymous Step 21 : Once done, click on Save button Step 22 : In build menu on the left hand side panel, click on Realtime databaseStep 23 : Click on Create database Step 24 : Select Realtime database location by click on dropdown menu and after select click on next Step 25 : Click on Enable Step 26 : 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 27 : Delete the entire code 

Step 28 : Now enter the following code, and click on Publish

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