Change name appearing in Track Changes with Microsoft Word 2011??

i have word 2011 , registered name "user" since don't name automatically being appended properties section of every file create. when use track changes, though, name logically shows "user" , gets confusing classmates , colleagues want know (which happens want many people edit document using track changes). can change name shows track changes without re-registering office itself? googling question finds lots of answers explain how in office windows haven't been able find in office mac. thanks!

 

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