Enable two factor authentication for users
Admin users can enable two-factor authentication for users by turning on the feature “Use 2FA (two-factor authentification)”.
Go to the “Login options” and turn on 2FA;

First time the user, with 2FA enabled, sign in she is prompted to pair a device and login to dRofus with an additional one-time password as explained in Two Factor Authentication (2FA) using one time password
When 2FA is activated an administrator, can turn it off by selecting the same button;