These instructions are intended specifically for enabling two-factor authentication for Manage users.
What is Two-factor Authentication (2FA)?
Two-factor authentication (also known as 2FA) means that instead of just a password (one factor), you will need two factors (password, plus a rotating authentication token) to login to your Manage account. Only the correct combination of the first and second factors will allow you to log in. Two-factor authentication is more secure than one-factor authentication.