Click on Page Layout to show that ribbon.
Click on Margins
Select the appropriate margins. If what you need is not listed there, click on custom settings on the bottom of the window.
NOTE: If you wish to make this the default, click on default in the lower left corner of the dialog box before clicking "OK."
Click on Format>Margins
Change margins you wish to change by entering the number of inches under "Document Margins."
Click "OK."
Created November 13, 2011