I want to click answer button to answer the qustion

[enter image description here][1]

<?php require_once('connection.php');  
session_start();


if (isset($_POST['Submit']))
{  
   $answ = $_POST['answ'];      
   $email = $_SESSION['email']; 


   $insert = "INSERT INTO `id18159895_adproject`.`que` (answ,queID,email) SELECT que.queID FROM que   " ;
   $result = mysqli_query($con, $insert);

   if (!$result) {
       echo "<script>alert('ERROR !!!!! '); location='qna.php';</script>";
   }
   else {
       echo "<script>alert('Successful Post'); location='qna.php'; </script>";
   }

}
?>

how can add the answer to the current question with my logged email?