Let me test this before I tell you how to do it in case it doesn't work LOL...
ETA: Ok it did work LOL! All I did was open up your picture through your album; and when the pic was on my screen I right clicked on it and then chose the option "Copy Image Location."
Then I came back to this Reply (or new thread) box. At the top where it has options for Fonts, Sizes, Etc. there is a little button of a yellow square with a tiny mountain thingie on it. If you click on it, it says "Insert Image" and asks you to type in a link. That is where you will delete everything currently in the box and Right click / &
Paste your Image Location.
After you do that, you'll see it show up on your screen with little [ IMG ] at the beginning and [ /IMG ] things surrounding the link (without the spaces). That is the code. You can also just memorize it and eventually you'll get used to typing it at the end and beginning of links you want to show up as images. Once you Submit the thread; the image will show up in your thread.