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It should work. Look at the edit of my comment above. Click on the markdown styling guide while editing for some help. You might have to use an externally stored image though... Like this service https://imgsafe.org/
You have to use something like this in your post:
![Image of Yaktocat](https://octodex.github.com/images/yaktocat.png)
Please give it a try.

Done! Thank you!