As of 2014, to reblog a post on Tumblr, click the Reblog button on the post you want to reblog from your dashboard or from another user's blog. If you have more than one blog, click on the name of the blog where you want the post to appear.Continue Reading
Locate the post you wish to reblog. You can reblog a post either from your dashboard or directly from another user's blog. To reblog from another user's blog, you typically need to reach the permalink of the post. The permalink is a unique URL for each specific post on a Tumblr user's blog.
Click the Reblog button below the post to reblog from the dashboard. The button is represented by two arrows rotated to form a square shape. Click the Reblog button with the text "Reblog" and the same symbol in the top right corner of the permalink of the post you wish to reblog directly from another user's blog.
The post window appears after you click the Reblog button. Click the blog name where you want the post to appear in the top left corner. After you have made your selection, click the Post button in the bottom right of the window to finish the reblog.