Yes you can go back and edit further. I have my blog to go back 100 posts. I think that might be the beginning of time.
When you get into the blog check the top of your screen. You will see a place that says show, you most likely have 5 in that number. If you click on the arrow it will give you other options. Hopefully when it edits that post it will bring it up to the top of the postings.
Try it and see. Otherwise let me know what you'd like to edit and I will try to bring it up.
is it possible to edit posts that are farther back than the last five posts ? They are not offered on the edit screen, I wondered how to access.........