ok...
right click on the photo, and copy its address. In this case the address is:
http://datsun1200.com/modules/myalbum/photos/5599.jpg(note: this does not need to be on this site, it can be on any site on the net)
where you reply, or start a thread there's a button that says "IMG" on it (near the "QUOTE" button)
click on the button
a little box pops up asking you to enter the URL of the pic you want to add. Paste what you copied before into this box, and click ok.
another box pops up asking you what location you would like to put your photo in your thread. left, centred or right. You can aslo leave it blank which is easiest, and usually most effective.
something like the following pops up where you write your thread:
[ img]http://datsun1200.com/modules/myalbum/photos/5599.jpg[img]
this was slightly modified so that it wouldn't show the pic, but the words...
write whatever else you want in the thread and click on submit!
easy...
sing out if you have any probs