So you ask in the wrong forum... Your best bet if you didn't know where to post was to look up wordpress, you may have seen some posts in results about word press.
Wordpress is written in a SERVER-SIDE not language and you could have asked in the PHP forum to see if anyone knew.
As for finding stuff back end, generally with these types of scripts, you will need to consult the wordpress documentation and ask in their user forums. You should ask them which scripts generate the web form and form processing scripts and their paths.