Two-factor authentication

On the Account and Setttings page, you can enable two-factor authentication with an authenticator app like Google Authenticator. Note that multi-factor authentication via SMS or email is not supported at this time.

After installing an authenticator app on your phone, click Enable and you'll be presented with the dialog below. You'll need to scan the QR code with your phone and enter the six digit code that results. Subsequent logins from the same device will usually require just a username and password, but you'll occasionally be asked to enter a code from your authenticator app.