It's located at https://www.tumblr.com/. If you're signed in on your browser, this will take you to your Tumblr home page.


If you aren't signed into Tumblr, enter your email address and password, then click Sign in.
 It's in the top-right corner of the Tumblr page.
 You can disable Twitter for any type of post.
 It's a bird-shaped button at the bottom of the post window. Doing so will prevent the post in question from going to Twitter as well when you publish it.


If the bird icon is grey, your post is already not going to Twitter.
Go to Tumblr's website.
Click the pencil icon.
Select a post type.
Click the blue Twitter icon.
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