Chief is this the one you wanted?
when you click on reply you will see just above the post text box a row of buttons. The last one on the right is the image button and when clicked it comes out like this
[i m g ]http://put.url.here/image.file[ / im g ]
Now if you take out the 'http etc between [img] and [ / i m g] (I left spaces so you could see it) and paste the URL of your picture it will work.
cheers
Cliff