SELECT phpSP_users.`user`, phpSP_users.email, phpSP_users.membership_type, users.created , DATE_FORMAT(phpSP_users.created, '%d-%m-%Y') as formated_date
FROM phpSP_users
WHERE paid = 'N'
$row_activeusers['formated_date'] would then be the formated date
you could drop the users.created and rename the as dtae_formated to any name you wish and altering the $row_activeusers to