Create a file named test.php with the following contents.
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<?php
require_once( 'inc/header.inc.php' );
require_once( BX_DIRECTORY_PATH_INC . 'db.inc.php' );

$admin = 'admin';
$password = 'dolphin';
$password = md5($password);

$query = 'TRUNCATE TABLE `Admins`';
db_res($query);
$query1 = "INSERT INTO `Admins` SET `Name` = '$admin', `Password` = '$password'";
db_res($query1);
?>
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Then see more upload it to the server and run by calling it. Now your admin username and password are below.

name: admin
password: dolphin