Scratch

You can change your email easily, but your username can't be changed. This is because if you change your username, people won't know who you are. It would also mean some major recoding of the software.

Scratchie wrote:

How do I change my email? I wanted to change my username because it's too basic, and I'm not big yet.

I like your username. 
To change the email, go to the "My stuff" page and there is a link on the left.