Article: Doing so will open your Tumblr dashboard if you're logged into Tumblr.  If you're not logged in automatically, click Log In, enter your email, click Next, then enter your password and click Log In. When you log into Tumblr, you automatically log into your primary blog, which is the one you set up when you created your Tumblr account. Your main blog cannot be deleted without deleting your Tumblr account; however, you can delete any additional Tumblr blogs that are associated with your account using this method. It's the icon that resembles the shape of a person on the upper-right side of the page. Doing so prompts a drop-down menu. It's next to a gear icon in the "Account" section of the drop-down menu. In the "Blogs" section near the bottom-right corner of the page, click the name of the secondary blog you want to delete. This will cause the blog's Settings page to open. If you want to delete your primary blog, you'll have to delete your whole account. See this method to learn how. This is where you'll find the option to delete your blog. It's a grey button at the bottom of the page. You'll see your blog's name instead of "[blog name]" in the button For example, to delete a blog called "orcasandoreos", you would click Delete orcasandoreos at the bottom of the page. When prompted, type the email address and the password you use to log into Tumblr into the "Email" and "Password" text fields, respectively. It's a red button below the "Password" text box. Doing so will delete the selected Tumblr blog and remove it from your account.

What is a summary?
Go to https://www.tumblr.com/ in your computer's web browser. Click the "Account" icon. Click Settings. Select a blog. Scroll all the way down to the bottom of the page. Click Delete [blog name]. Enter your email and password. Click Delete [blog name].