You can create custom headers and footers with this button. For MLA, you can put your last name in the top right of your header, before the page number. For APA, you can select the option "Different First Page" to mark a "Running head:" in the top left of page 1 and type the running head in all CAPS on page 2 in the top left of the header for it to appear on all subsequent pages - with the page number in the top right.