I'll do a quick version and post something better later.
Images must be hosted on a photo site somewhere to post them here. We do this to reduce the load on our servers.
Post your photo to one of the photo hosting web sites, then go to the web page where it is displayed. Right click on the photo and copy the URL (http://www.photohosting.com/your_image.jpg
Then just use our software image tags to post it.
Example using the link above:
I have left spaces between the tags and the URL, which you don't do when you post a photo, otherwise all we would see is a red x.
You can also use the "Reply" button, rather than the quick reply box, and have the image button (looks like
) insert the tags.