Tumblr – How to link to photo permalink from Tumblr dashboard

Mehper's answer no longer works, as Kirk Woll mentions. As of Feb 2015, you need the following URL to edit:

https://www.tumblr.com/edit/<post_id>?redirect_to=%2Fblog%2F<blog_name>

Replacing < post_id> with your post ID # (example: 406783219) and replacing < blog_name> with the domain of your blog, without the tumblr.com part (example: staff).

https://www.tumblr.com/edit/406783219?redirect_to=%2Fblog%2Fstaff

Obviously, you have to be logged in to your account first, and have the appropriate edit permissions.

Add the {Permalink} option using the anchor tag and the div tag applied to your Photo block

{block:Photo}
   <div class="photo post">
      <a href="{Permalink}">
         <div>
            <img src="{PhotoUrl-500}" alt="{PhotoAlt}">
         </div>
       </a>
      {block:Caption}{Caption}{/block:Caption}
   </div>
{/block:Photo}