The errors are:
Notice: Undefined index: name in C:\wamp\www\contact.php on line 9
Notice: Undefined index: email in C:\wamp\www\contact.php on line 10
Notice: Undefined index: message in C:\wamp\www\contact.php on line 11
Warning: mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in C:\wamp\www\contact.php on line 13
You are assuming that those keys exist in the POST array.
This code should fix 3 of 4 errors.
<html>
<head>
<title>Joerassic Park</title>
</head>
<body>
<?php
$error = false;
$name = isset($_POST["name"]) ? $_POST["name"] : null;
$email = isset($_POST["email"]) ? $_POST["email"] : null;
$message = isset($_POST["message"]) ? $_POST["message"] : null;
if(is_null($name) || is_null($email) || is_null($message)) $error = true;
if(!$error) {
$to = "joerassicpark.ddns@gmail.com";
$subject = "Contact For";
$headers = "From: $email";
$sent = mail('joerassicpark.ddns@gmail.com',$subject,$message,$headers);
}
if(!$error && $sent){
print('<a href="contact.html">Thank you. Click here to return to site.</a>');
} else {
print "There was an issue with your contact form";
}
?>
</body>
</html>
However your last error indicates that you do not have a mail server configured.
This has been answered in a previous question here.