Dan..what the above is talking about is you have to host them somewhere and then link to them in your post.
You will also see in the Reply section..if you scroll down..and place where you can attach a photo. This will provide a little pic that the reader clicks on that will show the enlarged photo..but we don't allow much size..97kb for a .jpg max.
Here's a photo of Rapid Randy's altered from a while back.
It's hosted on PhotoBucket and all you have to do is insert the [img] tag provided by them..which is:
IMG]http://img.photobucket.com/albums/v652/willymon/Rapid1.jpg[/IMG]
If you notice the lack of [ at the beginning of IMG just above..which allows me to show the tag.
Let us know if you need more..there are lots of free photo hosting sites out there that do this.