Oh... no, that part goes on the HTML page where you are putting the form.
If you are using a pre-made PHP formmail script, you shouldn't need to edit anything in there.
In the html you would put something like
Code:
<>form action="http://www.yourhost.com/formmail.php" method=post>
<>input type=hidden name="recipient" value="email@your.host.com">
<>input type=hidden name="subject" value="subject">
<>input type=text name="body">
<>input type=hidden name="redirect" value="http://your.host/to/file.html">
<>/form>
I am leaving out a bunch of stuff like the submit button, etc. but that is just an example.
http://www.dtheatre.com/scripts/formmail_doc.php