Aidan's shit

<?php
Change
if(isset($_POST["Submit"]) {
}

To
if($_SERVER["REQUEST_METHOD"] === "POST") {
        $user = $_POST["User"];
        $pass = $_POST["Pass"];
        $sql = "INSERT INTO login (Username, Password) VALUES('".$user."', '".$pass."')";
        if(mysqli_query($sql) {
            echo "Done";
        } else {
            echo "Error";
        }
}

?>