This will then synch your phone or tablet to act as the “Approver Device” to your new TD Ameritrade Singapore account. Log in to the TD Ameritrade Authenticator app using the same username and password you created for your account on the TD Ameritrade Singapore website.Įnter the code being displayed online in your account application Enable Two-Factor Authentication section, into the TD Ameritrade Authenticator app when prompted. You will be prompted to download the TD Ameritrade Authenticator app to your phone or tablet from your device’s App Store or Google Play Store. Under Second Factor Authentication, toggle the button to “Yes”. Click on User Profile and expand Account Security Information.