It seems that BLOGGER doesn't automatically turn on old posts once you install commenting?? So, I have to do it manually for a couple of hundred posts if I want it on...fun, fun! However, according to BLOGGER's online help, there is a bug in BLOGGER right now and it will only go back 300 posts. So half my blog will not have commenting until that is fixed. It also means I can't edit that part of my BLOG if I want to make changes. Hopefully, they'll get this all fixed.
But, hey, at least I figured it all out on my own.