It seems that the editing of thread titles has not been activated on this forum - infact, very few V Bulletin ones I have been on do it!
It would be useful though, especially in progress threads, e.g. changing a title to reflect a new mod or new pics "My Progress Thread - new pics post #90"
There is, but it only alters the "sub title" not the thread title.
I just tried editing a post title on THIS THREAD by adding three dots into the title - and as you can see on the first post, they have appeared, but not the main topic title