Board Thread:Support Requests - Getting Started/@comment-25188509-20140716205734/@comment-4568327-20140716213119

You are confusing "username" with "email address". Your email address is.... your email address. Your username is what everyone sees you as on Wikia, and is the name you use to log in.

Changing your email address is fairly simple, changing your username requires Wikia Staff to intervene, and is complicated.