You need to put a variable in there so that it picks up the senders email address. It might be the code that is in the email address field.
Each script will have a different variable so I can't tell you what it is.
This is what the code looks like on the contact form that I use on blogs. It's totally different than what you need but shows how you use variables when setting up contact forms.
Code:
<p>Your Name (required)<br />
[text* your-name] </p>
<p>Your Email (required)<br />
[email* your-email] </p>
<p>Subject<br />
[text your-subject] </p>
<p>Phone Number<br />
[tel tel-834]</p>
Try replacing
myballs@yourchin.com with the variable that is in the form field that is in the field that they put their email address in.