Being a ditzy female now…

Being a ditzy female now I can’t find the ‘notify me of new comments via email’ tickbox, other than in the new post. Has it always been like that? I hate wasting energy looking for things that never existed in the first place. It’s worse than finding something that was there just happened to have disappeared. I only back up my own posts by the way, as we all should on any online service, if preserving our content is somehow important.
#help