"If it's a picture you have, you must post it on a publicly-available website somewhere. If it's a picture that is on a website, you can find the file name by right-mouse-clicking on it and clicking on "properties" to find the website address (URL) of the picture.
Once you have the website address of the picture, you can include it in your post so that it looks like this (don't use any spaces in it though):
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