The easiest thing is to upload your photos to a web picture hosting site. I use photobucket. Then to imbed your photo in your reply you click on the third icon from your right on the reply window. It looks like a picture frame with a tree in it. Once you've done that click on "from URL". Uncheck the box that says "retrieve remote file and reference locally". Then copy and paste the web address to your picture from your hosting site (photobucket in my case). Click ok and the picture should be in your post.