Ok, I've got Fotki, the basic free one. This works, I've done it 3 times now. Go to fotki and...
1. Open the picture you want
2. right click and select "copy image" NOT "copy image URL"
3. Click to open the reply box at the bottom of the thread
4. Put the cursor where you want to place the pic, right click and select "paste"
5. Sit back and enjoy the simplicity.