The easiest way is to upload your pictures to photobucket.com, which is free (you might want to do only a few at a time, since it can take a while) then, after you upload them, you'll see the picture in your photobucket album. Under the picture is a little list:
E-mail & IM
Direct Link
HTML code
IMG code
Then, to the right of each of these, is a little, long box with text in it. Click on the box next to 'IMG', highlight the text, then push and hold CTRL on your keyboard. While holding the "CTRL" key, push the "C" key. This copies the text in the little box. Now, when you type a message in the forum, all you have to do is push "CTRL" and the "V" key to copy the IMG text into your message. That puts the picture in there. Any questions???