Paul on "How to use form action HTML embed via text input and where to store files?"

I have embedded some form code that works using a flat HTML file structure.

At current the submit action is searching for http://current/route/to/contact-test/phpmailersub.php.

I wish to know where to store the PHPMailer files and how to action them properly. Like I said before the method and code I used previous with a flat HTML file structure worked fantastically, so I must be missing something using a WordPress platform.

My current code:
<form class="contact_form" form action="phpmailersub.php" method="post" enctype="multipart/form-data" name="contact_form" onsubmit="return validateForm()">

Your help would be hugely appreciated! :)