-Define in your .htconfig.php:
-$a->config['tumblr']['consumer_key'] = "your-consumer-key";
-$a->config['tumblr']['consumer_secret'] = "your-consumer-secret";
-
-You can get it here:
+Register an application at this address:
http://www.tumblr.com/oauth/apps
+use (your server name)addon/tumblr/callback.php as callback URL
+
Tumblr-OAuth-Library:
https://groups.google.com/d/msg/tumblr-api/g6SeIBWvsnE/gnWqT9jFSlEJ