The picture has to be uploaded to the internet first, and have a web address. Then, you just put the address in the img tags, or (img)address goes here (/img) replacing the parenthesis with brackets. For example, if you wanted to use the FIRST logo, you would have to find the address for the image, and post it when you press the img button (the one with the mountain). It would look something like [IMG)http://www.usfirst.org/images/logo.gif[/IMG), except with brackets, giving you the final product:
