To use this feature Publisher must be set up to view a two page spread. From the Format menu, select Apply Master Page. Go to the page spread where you would like to apply the master page. In the Apply Master Page task pane, select Use the Same Master Page for Both Facing Pages. In the task pane under the left and right page icon will be a drop down menu for you to select which master page is to be applied to each page. In order to apply these changes you must select Apply to Page Range.