How do I add text message as 2FA?

Text Message-

Text Message two-step authentication works by submitting a one-time security PIN sent to the phone number of your choosing. (SMS-enabled numbers only. Please note message and data rates may apply.) This pin is sent upon correctly submitting your account username and password credentials.

• Please enter an SMS-enabled phone number in the provided field and click the Add Text Message button.

  

• Then enter the pin in the provided field and click the Verify button.