How do I edit headers?

Edit your existing headers and footers

  1. Double-click the header or footer you want to edit, or select Header or Footer, and then select Edit Header or Edit Footer.
  2. Add or change text for the header or footer or do any of the following: …
  3. When you’re done, select Close Header and Footer or press Esc.

For More Information Please Refer: https://support.office.com/en-us/article/edit-your-existing-headers-and-footers-490423a3-3e5b-4080-aff0-c429ab5d6708