Greetings ...
In the thread, I didn't see any mention of it, maybe too obvious, but you must be logged in to the forum with your post's original Login ID in order to edit your posting.
As an example, I viewed a recent posting of mine, both while logged in, and while not logged in.
The "Edit" link appeared while I was logged in, after all the message content. (Red Arrow in partial screen shot). That link was not shown on the screen when I viewed my post while not logged in.Regards ... Dave