How to change your minecraft username?

On Minecraft for computer you can't however I think Mojang are going to put are have put an update out that allows you to change your username however I'm not sure.

On Minecraft PE you go to the top left hand corner and click on the button then it should come up with a settig screen there you can type/change your username.
Hoped I helped you!

I thought it either was coming out or is thanks!