Easiest way would be to use the htacess redirect so that
www.yourcurrentsite.net redirects to
www.yourcurentsite.net/wordpress/index.html
Google htacess or 301 redirect for exact wording, i believe its simply
redirect
http://etc to
http://new where etc and new are replaced by the actual url. You can edit your htacess file in notepad, save it and upload it to replace whats there.
Karen