The first time you install and use an Office program, you are asked for your user name and initials in a dialog box that looks similar to this:
Your name and initials will be associated with any Office document that you create and will appear in places like comments, revisions, and general document properties. You can enter anything you like, but it’s a good idea to consider who you might be sharing documents with, or reviewing documents for, when choosing a user name. Most people simply use their first and last name.
Change your user name and initials
If you are creating Office documents that will be shared with others, appropriate attribution and correct author information can be important. You can change your user name and initials at any time.
Important: Changing your name or initials in one Office program will change your name and initials in all of the other Office programs installed on your computer.
Click File > Options.
In the Options dialog box, change your user name and initials in the Personalize your copy of Microsoft Office section.