1. With your cursor on the first page of your document, go to Insert , select Header or Footer, and then pick a built-in layout and design , or select Edit Header or Edit Footer to create your own.

    Add a header or footer

    Tip: Some built-in header and footer designs include page numbers.

  2. Whatever you want repeated on the pages of your document: add it in the header or footer area on the page.

    If you don't want the header or footer on the first page, select Different First Page.

    Different header or footer on first page

  3. When you're done, select Close Header and Footer.

    Close header or footer

Tip: To get back to a header or footer to make changes, double-click in the header or footer area.

Source: Microsoft