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<?php include("includes/db_config.php"); 
if (isset($_POST['submit'])) {
  date_default_timezone_set('Asia/Kolkata');
$name = htmlentities( $_POST['data']);
$detail = mysqli_real_escape_string($conn,$name);
$id=$_POST["id"];
$sql1 ="UPDATE  delivery_model  SET data='$detail'  WHERE id='$id'"; 
$res=mysqli_query($conn,$sql1) or die(mysqli_error());
    if(!$res){
        die('query failed'. mysqli_error($conn));
    }
}

<!DOCTYPE html>
<html lang="en-IN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Amerx</title>
    <meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport">
    <?php include("includes/css.php")?>
</head>
 <script type="text/javascript" src='ckeditor/ckeditor.js'></script>

<div class="row">
                    <?php   $sql2="SELECT * from delivery_model";
                            $exe2=mysqli_query($conn,$sql2);
                            while ($res=mysqli_fetch_array($exe2))
                            { ?>
                        <div class="box box-danger">
                            <div class="box-header with-border">
                                <h3 class="box-title">Delivery Model</h3>
                            </div>
                            
                            <div class="box-body table-responsive">
                             <div class="row clear_fix">
                        <div class="col-md-12">
                                <label>Details</label>
                              <textarea name="data" id="editor"  style="height:200px; width: 400px"><?php echo html_entity_decode($res['data']);  ?></textarea>
                        </div>
                    </div>
                     <input type="hidden" class="form-control" value="<?php echo $res['id']; ?>" name="id" >
                      <button type="submit" name="submit" id="" class="btn btn-primary pull-right">Submit</button>
                            </div>
                        </div>
                    <?php } ?>
                    
                   
                </div>
            </form>
             
            
            </section>
        </div>
        <?php include("includes/footer.php")?>
    </div>
    <?php include("includes/js.php")?> 
</body>

</html>

Editing File: delivery-model.php