открыть memberlist.php и найти:
$sql = "SELECT username, user_id, user_rank, user_opt, user_posts, user_regdate, user_from, user_website, user_email FROM ". BB_USERS ." WHERE user_id NOT IN(". EXCLUDED_USERS_CSV .")";
заменить на:
$sql = "SELECT username, user_id, user_rank, avatar_ext_id...