How to delete your blog
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O1: Go to dash > click your blog title > blog settings

O2: Scroll all the way to the bottom and click "delete your account"

How to delete a secondary blog
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Go to http://www.tumblr.com/blog/YOURBLOGURLHERE/members and change "YOURBLOGURLHERE" to the url of the blog you wish to delete then click "leave this blog"