This functionality has been added - in your "My Voki" page - when you hover over the name of a Scene, you will see a small 'edit' icon - click on it to rename your Voki Scene.
Happy naming to all!
You can't do so at present.
We'll be adding this (obviously missing) functionality along with other upcoming features in the next few weeks.
Thanks for your patience,
Customer support service by UserEcho