Well, first I emailed a mod and never heard back.
I still don't know why I can't edit my original post. The edit button is simply missing from the post. So, instead I removed those pics from my album, resized them on my computer and resubmitted them about half the size they were (can't remember what size exacltly). Anyway, when I resubmitted them as an additional reply at the end of the post, but I did it a different way, by adding them from the menu on the 'post reply' under 'insert image' (little mountain icon across the top where you can change your font, etc.)
That's the way I'll do them from now on, it's easier I think.