First you need to get your photos on to the web. The best way to do this is to post them in the photo gallery --> http://truckconversion.net/photopost/index.php
You will need to establish a username and password (the forum and photo gallery are not tied together so you need to enter separate info) and then upload your photos. I will need to approve them. (when I do you will get a email) Once they are approved you will go to the picture in the gallery and right click on the photo, a menu will popup and at the bottom click on properties. This will give you the URL which you need to copy, in your post on the forums click on the picture icon and paste that URL in that space.
Your photo will now show up in the forum.