While logged in Navigate to "Settings and Support" Go to "Settings and privacy" Go to " Security and account access " "Go to ""Security"" Go to "" Two-factor authentication""" "Click ""Authentication App"" Then, enter your password." Click the "Get started" button "Scan the QR code on the ""Link the app to your Twitter account"" page using your authenticator app" Enter the confirmation code Choose the option to scan a QR code and point your device's camera at the QR code displayed on the Twitter website. You're all set