change the bold to zero = 0

go to register.php and change this block of code.... changing the number of seconds for example...

[code=php]

else if (isset($_POST['form_sent']))
{
    ($hook = get_hook('rg_register_form_submitted')) ? eval($hook) : null;

    // Check that someone from this IP didn't register a user within the last hour (DoS prevention)
    $query = array(
        'SELECT'    => '1',
        'FROM'        => 'users AS u',
        'WHERE'        => 'u.registration_ip=\''.$forum_db->escape(get_remote_address()).'\' AND u.registered>'.(time() - 3600)
    );

    ($hook = get_hook('rg_register_qr_check_register_flood')) ? eval($hook) : null;
    $result = $forum_db->query_build($query) or error(__FILE__, __LINE__);
    if ($forum_db->num_rows($result))
        $errors[] = $lang_profile['Registration flood'];
[/code]

A new user was registered with the same IP address as you within the last hour. To prevent registration flooding, at least an hour has to pass between registrations from the same IP. Sorry for the inconvenience.