Most Helpful Guy
You cannot do this directly. You have to upload it on photo hosting website like http://postimg.org
Upload your photo there
And then copy the "direct link"
Then paste that link in your comments.
Most Helpful Girl
Hold down on a photo and a screen should come up with one of the options being to copy the image's URL. Choose that option and paste it in your opinion or comment. It should have a. jpg ending on the URL.0