How do I set up SMS Authentication?
If you’re creating a new account, you’ll have a chance to add authentication when you register. If you already have an account, you can add authentication on the account management page by following these steps:
Click the “Security” link at the top of the page, then “Edit” on the left side next to “2-Step Verification.”
Select your phone’s region from the drop-down menu and enter the full phone number (including area code) in the box.
Select “Text Message” or “Voice Call” to choose how your security code will be delivered.
Click “SEND VERIFICATION CODE” to have the code delivered to your phone (it generally takes less than a minute to arrive).
Once you get the code, enter it in the box and click “NEXT.”
Click “FINISH” to complete the process and return to the account management page.