1. The pictures need to be "web size", ie: around 800px wide and under 200kb jpeg
2. Then go to "advanced reply" when posting a reply.
3. When posting a new thread, it's already there
4. Scroll to the bottom and look for "Manage Attachments"
5. Browse to the image, select it, and click upload.
6. That's it.
Make sure you don't have popup blockers on, and make sure javascript is working, and make sure iceinspace.com.au is in your firewall white list.