The user name Wikinewsies choose for themselves is no longer set in stone. Until September 2014, Bureaucrats were able to change user account settings and article histories such that all previous edits of a given user are attributed to the new name, and this page contained requests to do so. However, after September 2014, this ability was removed in favour of Stewards globally renaming users to ensure that the same user had the same name across every Wikimedia Foundation project.
To rename your account, contact a Steward on Meta, the coordination site for Wikimedia projects, at m:Steward requests/Username changes. Local bureaucrats are no longer able to rename users.