Scott,
Welcome!
You have 2 options. 1) like we did by posting first on a 3rd party like flickr. Then copy the link and post in your message text using the img /img (in brackets) - there's an icon on the left above your typing window that will help. 2) down at the bottom there is a button to "attach" it will always be at the bottom of your post. So far, using that option I've been hit and miss.
