How do I enable two-factor authentication?

1) Click your avatar and choose 'My profile', then open the 'Password and Security' tab. 2) Click 'Enable' next to 'Authentication app'. 3) Enter your phone number and confirm it with the 6-digit code sent to you. 4) Scan the QR code with an authenticator app such as Duo or Google Authenticator, or type the setup code into the app manually. 5) Enter the confirmation code shown in your authenticator app to finish.