The first thing you have to do is find some online space to store them. (also known as a host) I use a free hosting service called photobucket>
www.photobucket.comSo get your self registered at photobucket and upload a picture or two. yes you have to put up with a certain amount of advertising etc but its reliable and free, I've never had any drama's with them.
once your picture is uploaded and you can see it in a web browser you simply (cntrl c) copy the web address for your photo and when your typing a message on the forum you hit the "insert pic" button.
the insert image button looks like this:

The you simply cntrl v paste the image link in between the image quotes like this:
"[i.mg]http://s83.photobucket.com/albums/j284/youralbum/your_pic.jpg[/img]"
thats all you need to do. by the way, that fullstop in the first brackets shouldn't be there..
