Admin users can enable two factor authentication for users by turning on the feature “Use One Time Password (2FA)”.

Go to the “Edit user” option 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 you, as administrator, can turn it off by selecting the same button;