If you wish an image to appear in your post you must first have it posted to an image hosting site (i.e. Photobucket) and then use that image link to have your picture appear here. You post the image link, highlight it and then click the "IMG" BBCode tag in the posting menu.
Here for example, is a posted image:

Over the next few weeks we will upgrade the BBCode functions so there is more control over the posted images. For example, the forum is currently set to allow a maximum image size of 800 px so if your image is larger than that you will need to reduce it on the image site you are using. We will add a new image code to the LTS Forum so you can adjust the image size here, regardless of the size on the image site.
Also to be added will be the BBCodes to insert YouTube clips, etc.