The folder with wp-admin, wp-content, and wp-includes, as well as all of the other .php files, should go right into your website’s main root. For example, it should look like this:
http://yourdomain.com/wp-admin
http://yourdomain.com/wp-includes
http://yourdomain.com/wp-content
If you want to have wordpress on the front of your website, don’t copy the folder titled ‘wordpress’, copy everything else though the way it is.
Hope this helps.