Look Shellie!!! I did it - so you must be able to also. It was my 1st time and I tried both of their instructions and they both worked. Are you using the Img button before and after the photo you are inserting?
Right Click over image,
select copy image location,
in message body click on Img button,
next, click on ctrl v to insert image that you previously copied,
last, insert another Img button from above.
Like Penny said, when all else fails, (I know it's hard, but....) ask your kids.
I use firefox also - one of my kids told me to.