Add to Chrome.
Click 'Add extension' above.
The installation process should take less than a minute.
Next, you'll Create an Account.
How do I set up YubiKey NEO and LastPass?
You can learn how to set up your YubiKey NEO to work with LastPass by following the instructions at https://helpdesk.lastpass.com/security-options/yubikey-authentication/#h4 .