First you start the Tumblr Poster feature
You select the Video button.
On top you see the normal ninja settings for posts. Select the delay between posts, delay between reblogs and so on.
You can select where you want to add your video to.
Post Now, means in will be posted instantly, you can add your post to the draft or queue or post it privately
Click on LOAD BLOGS and all your tumblr blogs will be loaded into the list. You can now select the blogs you want to post to.
Add your message into the form. Don’t forget the tags!
Click on ATTACH VIDEO and select the VIDEO you want to post.
Give your project a name and SAVE your project
TUMBLR TUTORIAL VIDEOS:
How To Auto Post Videos To Tumblr
How To Auto Post Your Videos To Tumblr Queue
How To Auto Post Your Videos To Tumblr Blogs Draft
How To Auto Post Your Videos To Tumblr Privately