On a PC, In your document, click File and then Info. If you are submitting an electronic version of your document to a court, opposing counsel, etc., you will want to remove the history of changes to your document so that your efforts at crafting your legal arguments and presenting the facts are shown in their final version, rather than all of your initial efforts being available for comparison. If you are turning in an electronic version of your paper for grading, you will need to remove your name from your document to ensure anonymous grading.
Microsoft Word automatically saves the name of a document's author, as well as the history of changes to your document.