How to Change the Registered Name of a MacBook

Go to the “Apple” menu and open “System Preferences.” In the window, select “Accounts.” Press on the lock-shaped icon in the lower left corner of the screen. Enter your password in the on-screen prompt.
Change the user name on the account by typing the desired name into the text box. Change the password, if desired, by pressing on the “Change Password” button.
Press the “Show All” button at the top of the window to return to the main System Preferences screen. Click on the “Sharing” button.
Change the computer name and the local network name for the computer. Enter the desired name for the computer in the text box. Press “Edit” to change the name as it appears on the local network. After you are finished, prevent further changes by clicking the lock icon in the lower left corner of the screen.
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