just in case you need it:
hit repy (or edit your post).
in the reply window, scroll down to the "Manage Attatchments" button: press it.
This should open a new window titled "Manage Attatchments".
In this window click the "Browse" button.
This should open a "Choose File" dialog box.
Navigate to the image you want to post (you have to do one at a time) and click once on it.
Click the "Open" button.
This should close the "Choose File" dialog box and you should now be back in the "Manage Attachments" window.
There should now be some wordage in the box to the left of the "Browse" button, probably something like "C:\Documents and blah blah bla".
Now press the "Upload" button (located to the right of the "Browse" button).
Wait for the file to upload.
When done you should have a section at the bottom of the "Manage Attachments" window titled "Current Attachments", in this section should be a link to you image (which has now been uploaded the the sn servers), should say something like "engine.jpg (145kb)"
Now press the "Close Window" button.
Now, just above the "Manage Attachments" button there should be a link to your image "engine.jpg (145kb)", click it and copy its address from the "Address" bar in explorer.
Now past this in your post.