To get the Contactform working, please read this part of the documentation carefully.
To use the form, please always use it as it is from the original code. With knowledge of jQuery you can adjust the script if you'd like, but it's currently built for the items shown.
Look for the /php/ folder. Inside there's the mail.php file which you need to edit.
In there, look for the following line:
to = 'e-mail@example.com'; //Your e-mail address
Obviously, you can change the 'e-mail@example.com' into your own e-mail address.
Note that this contact form will only work when it's used on a server with PHP and the PHP mail() function enabled.