Always could change it.
Well. They could always change the name. But I don’t remember being able to change the label, I suppose you could call it.
If you are a creator, you can change the name/label if the topic isn’t old.
For example, I can’t change my topic for Usara the Master Wizard because it’s 9 months old now (Chapter 3: Capture, has been released! Check it out!).