1. Open or log on tumblr
2. Click on Head or Profile button
3. Choose your blog from the drop-down menu
4. Click on Edit Theme
5. Now go through edit HTML that you can see in the left side top corner section
6. You can starting tag in the code, just you paste Social Proofy Pixel Code
The code will be added to all pages on your site and Social Proofy will start working.
Now verify your pixel in Social Proofy.