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Mike, you should be able to hit "Choose file" when you are posting a new message near the bottom; it will let you attach 1 image to each post. (You have to have the image on your hard disk somewhere.) To post multiple images, you can just add posts to a thread. Let me know if you need more info.

To post images that are already on a web page somewhere, you can use the "IMG" button at the top. However, the images that you tried to post seem to have some other issue with the webserver they're hosted on, as they show up as "Forbidden". So if you can't get that working, you can use the attach method I just described.