Adding the Page Number Header in Word
Click the INSERT tab.
Select PAGE NUMBER.
Select TOP OF PAGE from the drop down menu.
Select PLAIN NUMBER 3.
Click your cursor to the left of the number "1"
Type your last name.
Double click on the main body of the essay to exit the header formatting section.
There you go! That should work for Microsoft Word. For Apple or Google Docs your on your own. Don't get frustrated if you have trouble. Every problem has a solution.