Two-Step Authentication is only available if enabled by an administrator.
With Google Authentication, the user will need to enter a code after logging into the site. The code can be obtained from the Google Authenticator app on a mobile device. Google Authenticator is available for many devices, including Android, iOS and desktops.
With Email Authentication, the user will need to enter a PIN Code after logging into the site. The PIN Code can be obtained from the email sent to the user's email account after logging in.