To post pictures in threads you have 2 methods.
1. Upload them to an image hosting site like Imgur. Once uploaded, copy the url for your picture and paste it in the img tool (icon beside the chain link one above when you are in the post message page.)
If you use imgur I find the large thumbnail is a good size to use.
2. Photo hosting ability is included with our team membership. When you start a thread or are replying in one you will see a gray box below the submit menu bar. click on that and follow the steps.
new members please read this post by VA-gunnut