Upload your picture to a site like Photobucket.com, then take the URL of the picture and put image tags around it. the front tag should be [IMG] and the back tag should be [/IMG].
so this is what it should look like, but WITHOUT the periods in it. (they are so it won't turn into a picture for this example)
and this is what happens if you don't have the periods in it..
Hope this helps...