then you need to add the url or address of your picture, you can get this by right clicking on an image and going into properties. The image needs to be uploaded onto the internet using a picture hosting site eg photo bucket http://photobucket.com/
Hope this helps
click on the gallery link at the top of forum then click upload. They may need resizing first.
Then to post them click on the image button under the smilie box on your new post.