Yes do you see the Image i put up there? i don't know how to post images in replies
If it's from the web, right click the image and Copy File Location, then go into a reply, press the bottom left icon on the Add BBC tags: (It will make [IMG] tags), then post the file location into those tags.
If it's a file on your computer, click Addition Options under the reply text box, then upload the file with the Attach: thing.
Or upload it to imgur.com which is pretty much the combination of the first and second methods