CGI form mail vs formbuilder

I know how FormMail working. But I do not how form builder is supposed to work. It seems to be another way of thinking. Moreover, it is dynamic. This feels like a premium for me when I just want to run FormMail functions. But how can I still use form builder and at the same time use formmail. Below are the first lines of the old form. It shall be the same data but now a new design. So then I thought to do it in the form builder.
<form action="/cgi-form/formmail.pl" method="POST" name="presentkort" id="presentkort">
<input type="hidden" name="recipient" value="info@drakamollan.com" />
<input type="hidden" name="subject" value="Köp of presentkort" />
<input type = "hidden" name = "title" value = "Thank you for your purchase of gift certificates!" />
<input type="hidden" name="env_report" value="REMOTE_HOST,REMOTE_ADDR" />
<input type="hidden" name="return_link_title" value="Tillbaka to hemsidan" />
<input type="hidden" name="return_link_url" value="http://www.drakamollan.com/svenska/romantiskhelg.php" />
<input type="hidden" name="bgcolor" value="#E2EDF4" />

in the css form builder wizard, you would set the action to:
/cgi-form/formmail.pl

then edit the form contents to add the hidden form elements, make sure to use the same names from the code snippet you posted.

after the form is created, edit those hidden form elements to set the initial value.