If so, how do I do it? Thanks :)
The short answer is no.
The long answer is if you contact customer services, they can try to change your username, but there needs to be an absolutely really good reason as to why you need to change your name - it's not just a simple case of changing your name, as it's connected to your account, so lots of things need to be adjusted, and is obviously time consuming for those involved - which is why you need to really think carefully when choosing your username.
Okay thanks, didn't know if I was just being dense!