Sorry, that's not really possible. It's not just "a HTML code", it's a complex combo of HTML, Javascript and server-side PHP/MySQL. You won't be able to put it on your site unless you have custom hosting. Also, it's tied into the Q&A software to link it to user accounts.
(P.S. please try and write better titles for question in future. "Hey Pokemaster" doesn't make sense. Thanks.)