We don't support that. You would have to upload your picture somewhere else (i.e., tumblr, imgur) and then use the "IMG" tag on our site to embed it in your post.
Now, looking at your post, the issue is not that you need to upload the image -- you're trying to embed an image from elsewhere on the web, which works fine as is. You just need to get the actual URL of the image, not the google image search URL, which is what you actually pasted there.
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