Where is the picture? On a website somewhere? On your computer?
If it's on your computer, go to imagur.com and upload it. Then just copy the "BBCode (message boards & forums)" and post it here.
If it's already on the web, right click on it and select "Copy Image Address" (or something like that) and then post that here with:
[ IMG ] paste address here [ /IMG ]
(remove the spaces between the square brackets and the "IMG".