You need to verify your phone number in order to use SMS Two-Factor Authentication (2FA). Click here to know how to verify your phone number.
To enable “SMS Two-Factor Authentication, you need to click/tap "enable 2fa via SMS" button on the settings page. Then, you will be asked to enter a one-time “six-digit code” that was sent to your phone.
When you receive the code, input it on the screen and click/tap “submit”.
If you did not get the code on your mobile phone, please click the “Resend OTP” button (once every 20 seconds).
Each time you log in you will be required to enter a one-time passcode sent to your phone.