No problem, John!
There is an icon, in the comment toolbar, that kinda looks like a picture frame. Simply click on that. There will be a window that pops up with two tabs to Insert a Picture from....From Computer and From URL. Simply select which tab, most likely from your computer. Go through and follow the easy steps after that and select your picture that you want posted. There will be a progress bar, briefly, as the picture uploads, then select OK. That should be about it.
Tony does have a request that we keep the posted pictures to a reasonable size, so please be sure to resize the picture so that it's not massive.
Good luck and I hope this helps!