1 Define in your .htconfig.php:
2 $a->config['tumblr']['consumer_key'] = "your-consumer-key";
3 $a->config['tumblr']['consumer_secret'] = "your-consumer-secret";
6 http://www.tumblr.com/oauth/apps
9 https://groups.google.com/d/msg/tumblr-api/g6SeIBWvsnE/gnWqT9jFSlEJ