I see you have a bunch of ghost fish. You'd hardly even know they're there. har har har.
Actually, it depends on if you have the images hosted on the web or if they're on your computer. If they're on the web you can just put the url of each pic in between the tags.
If they're on your computer then when you go to reply to this you need to click on Go Advanced. From there you should see a button for uploading images.