Marty, these pics are usually linked from somewhere else (they've been uploaded somewhere first). Once your own pictures are posted to your webspace/page/site, you can use the "Img" tags here when making a new post, and the remote photos will show up.
For instance, to include a pic in your first post, you would add a line that points to where your pictures are, something like:
[img] http: // www. canreef. com / images / logo.jpg [/img]
But without the quotation marks, you don't see the code, just this:
