Insert a header. From the top menu in Word 2007, select "insert," and then choose "header." The process may vary slightly in different applications or different versions of Word.
Type the information you want the header to display into the header box that appears on the page. Typically, headers list a combination of the author's name, the name of the course, page numbers and the title of the assignment.
Choose "design" under the "header and footer tools" option on the top menu. That shows tools that allow you to modify the text, style and positioning of the header.
Find "header from top" in the last box on the right. That number represents the distance between the header and the top of the page. Make the distance smaller to reduce margins around the header.
Go to "view" on the toolbar and make sure "ruler" is set to display. The ruler will appear on the left side of the screen. Drag the header line up or down the ruler to adjust the bottom margin of the header. Drag it toward the top to minimize the margin around the header.