1. Check the Google account signed in on your play store (remember the account)

2. Click the below button

3. Click the square on the upper right corner. Select the same account signed in the play store.

4. Keep refreshing until you see 'BECOME A TESTER

5. Click on 'BECOME A TESTER

6. Search WhatsApp on the play store after 30min.

7. Update WhatsApp.

You become a beta user!