Thank you that we can edit the content of a post - either to correct a typo or to clarify something (when I read it at a later date).
However I'd like to do the same with the Forum thread Title. Could you set that up please?
Editing of Forum Title - please
Ooh, yes, that'd be nice, too!
Let me see if there's an extension for that 
8 days later
I've meaning to thank you.
I found the edit title 'button' and it works 
- Edited
It's very simple.
Go to the Forum thread, tap the three dots (top right) and it's one of the three options.