For tumblr, where do I put an html code?

S

Spicy Taco Breath

New member
So, i'm trying to add a code to my tumblr dashboard but I don't understand where to put it? Do I go to a special page?? how do i get there? Also, where do I put the code? The code is http://www.w3.org/1999/xhtml can someone go through where to go and how to put it ? thanks.
http://solimegreenjello.tumblr.com/
 
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