The header is in the Pagewrapper.
  1. Go to Setup -> Pagewrapper Editor
  2. Find the wrapper and select "Manage Versions"
  3. Copy the "Active" version and update the version and notes
  4. Edit your new copy
  5. Go to step 2 Meta Tags
  6. You can edit the Site Title, Meta Tags, and Header content all on this one page
  7. Save your version and publish!