since im very interested in this thread ill help you out!
click reply down the bottom of the thread. it will come to the message screen where you have a couple of options:
either go to the bottom, click browse to find a photo stored on your computer and then click upload. you can now submit. the problem here is that it only allows small size files, and your photos may be too big. sooo in this event...
the other option is to open an account with
photobucketwhere you can upload big images. now in the datsun1200.com message screen you need to click the picture of the little mans head above the text box. when you hover the mouse above it it says images. so after you have clicked him, you can copy the url of the image (which is actually given by photobucket) and paste it in.
surely this has been answered before, if this doesnt help click FAQ maybe? or ask in another section.