Now we need to set the proper font: Select your Last Name + Page Number => click on the Home tab => change the font to Times New Roman & Size 12.Now type in your Last Name => press the Spacebar on your keyboard once to make a space between your Last Name and the page number.Press the Left Arrow key on your keyboard ( to deselect the inserted page number).To create the header with your last name and automatic page numbering, click Insert => Page Number => Top of Page => then click on Plain Number 3.
How To Create a Header in Microsoft Word 2016: