How to Enable Two-Step Verification.
1. Go to WhatsApp Settings → Account → Two-step verification.
2. Click enable, set a 6-digit passcode and re-confirm it.
3. On next screen, enter your email ID (optional) to enable passcode recovery via email. (It’s recommended to use email as backup so that you’re not locked out of your account if you forget your passcode.)
4. Hit “Done, ” and you are all set to go.
Providing your email address is optional, which if enabled, will help you reset your passcode when you forget it.