Have you figured out the pictures yet?
If they are already uploaded to a site, you can right click the image and copy the image address. From there you can use the img button at the top of the post to add the img brackets, and then paste them in between the img brackets.
When you are typing it out it should look like this:
Code:
[img]Whateveryourimageaddressis[/img]
But when you post, it will show up as the picture
Additionally you can upload them straight to this site with the user image uploader, and then copy and paste the XIMG code to your post
-Brandon