Once you have registered your YubiKey, you can log into any MIT service easily. If you have not yet registered your YubiKey for use with Duo, read this article first.
The one-minute video below walks you through the steps in authenticating to an MIT service using a YubiKey.
For instructions on authenticating with a Smartphone, see the article below.
How do I login to MIT services that leverage Duo two-factor authentication?