I have the same problem as Kendra Sue F.

Tumblekit app would not connect to Tumblr. When I tried to run it, I received an "authorizing" message but ever nothing happened. Help or support for the app is nonexistent. As larryw408 indicates in his review, the apps Help link is a bad URL. The developer has a Tumblr blog but it has no information and has not been updated in over 5 months. I have been ripped off and Apple should remove Tumblekit from the app store to keep other people from being ripped off as well.

larrym9 about TumbleKit