I'm not sure if this is the best way to do it but I upload the image to photobucket and then get an HTML code (I think) and then paste it into the comment box. HTH!
I used to know but I forgot. If you go to my page (Tina) and look at my groups, there's one called HTML help or CSS help or something like that. It tells you how to do all that stuff. I always go there for a refresher when I need to post pics and songs.
You place it with an html code. For example, you can upload the picture at photobucket.com. Copy the html code for the pic and pasted in the comment box.