You almost got it. You were missing the http://www. in the address of the picture hosted on bocapix. I edited your post so you can see the difference in what you typed vs what I typed.

Once you get the hang of using the picture off the bocapix site, you won't need to upload pictures to the message board site. If the message board site host the picture, you can only display it as a thumbnail, so it's better to use the picture site if possable.

Mike