Two-Step Verification. Add an extra layer of security to your account with a
password. When enabled, it will be required each time you log in, along with the code sent to your device.
If you forget your password, you can
only reset it using the
recovery email you add during setup.
However, if you are
still logged in and can't access that email, you can request a
password reset to remove the password
after 7 days – but can be cancelled from any of your devices.
Go to Settings > Privacy and Security > Two-Step Verification to add or change your password.You can also enable a local
Passcode Lock – a PIN code that is required to
open the app and view your chats.