I can identify............ "Not smart enough to post a picture or I would."
Only happened once....

It took me years to finally figure it out. Actually Wiggy walked me thru it very patiently. I'm not near as good of a teacher as he is, but I'll try.
First, sign up to a pic posting site. I and many here use postimage.org. Then you can upload pics to their site. After that, when you click on one of your pics there will be a box that says "share". Click on that and it will open several other boxes. I use the one that says "hotlink for forums", to the right of it click that and it will say "copied". Then come back and in your dialog box just paste it. I think holding the Control button and pushing "v" will give you a shortcut for that. And that should do it.