1. Find a host for your picture (something like http://www.photobucket.com) and upload your picture there and get a link to your picture.
2. Copy your link (highlight it and right click on the link and click on copy)
3. Get over to the thread you want to post your picture on.
4. Post a reply or start a new topic.
5. Up on the top of the window you will notice a bunch of tabs, click on the Img tab.
6. Then make sure that the curser is on the right side of the
And viola, you should have your picture. There is no need to click on the URL tab for posting pictures.
Hope this helps, and if not, here's a link to a video that shows you how: http://www.youtube.com/watch?v=0zHOclDT9rY
Emery