------------------INDEX.PHP---------------------

<?php
require('connect.php');

if(isset($_POST['username']) && isset($_POST['password'])) {
  $username = $_POST['username'];
  $password = $_POST['password'];

  $query = "INSERT INTO users (login, pass) VALUES ('$username', '$password')";
  $result = mysqli_query($connection, $query);

  if($result){
    $smsg = "Регистрация прошла успешна";
  } else
    $fsmsg = "Ошибка";
}
?>

------------------------------CONNECT.PHP---------------------------
<?php
$connection = mysql_connect('sql7.freemysqlhosting.net', 'sql728399', 'ViYKMCw78');
$select_db = mysql_select_db('sql728399', $connection);
    mysql_query('SET NAMES utf8');
?>