Add to Chrome.
Click 'Add extension' above.
The installation process should take less than a minute.
Next, you'll Create an Account.
You might also find your answer in the LastPass Enterprise Manual.
Could a user continue to use two different passwords for Windows login and LastPass login?
Yes, a user could continue using two different passwords, one to login to Windows, and another to login to LastPass. The AutoLogin to LastPass when logging into Windows would continually fail, though, and this would largely defeat the purpose of Windows login integration.