Change:
Code: 
<form id="form_505287" class="appnitro"  method="post" action="">
to:
Code: 
<form id="form_505287" class="appnitro"  method="post" action="process.php">
then create process.php and put this code into it:

Code: 
<?php
if ($_POST)
{
$email = '';
foreach ($_POST as $k => $v)
 {
$email .= $k . " = " . $v . "\n\n";
 }

mail('YOUREMAILADDRESSHERE', 'Someone submitted the form', $email);

echo "Thank you for contacting us";
}

{
echo "Sorry you did not submit the form";
}

?>
Something like that, please note that this has not been tested and is a very basic way of doing what you're trying to achieve.