Hi Greg. Sorry I've only just spotted this. It's best to post something like this in the help forum that I'm watching, this is just a test forum I setup and haven't been watching. I'll move the post over there.
To answer your question. Using the 3 dots just allows you to edit the thread title, if you want to edit the post body itself then you need to open the post and click the Edit button in the footer of the post.
Hope that helps!
