Is it possible to edit/delete topic that I created?
you cn post 'please delete' and it wll, eventually, disappear
Why would you want to delete your post? Do you want the question to disappear once you got your answer? To me the only reason for a post to be deleted is because it was spam or otherwise violated forum rules.
To be able to edit your post is a right you have to 'earn'. See Community Ranking System and Recognition Program
Well, in my case the forum engine has changed my topic title to something different so now the name of the topic has nothing to do with its body:
So I want to either be able to edit the topic title (preferable) or to delete the topic as long as there are no replies from others.
Though I doubt the forum engine did any such thing, I've moved the post away for you.