MLA Style requires the use of a running header with page numbers in research papers. The running header is positioned in the upper right corner of the page and consists of your last name, followed by a space and the page number.
Note on group papers:
If you are writing a group paper, start your header on the second page of your paper after the title page. Add all students' last names followed by the page number at the top right corner of the page. If all last names do not fit in a single line in the header, you may just include the page number.