If you have a Photobucket, you upload it there, and on the side when you click on the picture, you'll see a bunch of options. You copy the "direct link" one, then you click on the picture icon in the reply, paste it, press "okay" and then I shall see the kitteh!!! Or... and this has worked in PMs before with my personal Facebook which is private up the wazoo, you right click the picture (not the thumbnail, but the actual picture) and click "copy picture URL" and do the picture icon here, paste, okay, and then post.