You can easily change your administrator's username from the Joomla admin area > Site -> User Manager. Once there, check the box next to the administrator username and click the Edit button located at the top-right Joomla menu.
In the Edit menu you should modify the name in the Username field. When you are done with the change, click theSave button.
You should use the new admin username next time you login to your Joomla admin area 
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