How to grab input email address and use it in FormToEmail.php script?

[Roydeblik]

I am using FormToEmail.php free script to send some form data from a page where user enters their email and recipient's email and obviously some text as message.In FormToEmail.php there is a place where I insert the email which I would like the content to be submitted. I need to set the email which is entered as "recipient's" email dynamically in FormToEmail.php file so that the content will get emailed to recipient's email. How do I do that?