Hi Elaine
My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.
Which version of Microsoft Word are you using?
Please note, if you are using the built in word processor in Windows 10: WordPad or Notepad, you can't use it to save templates.
You need to use Microsoft Word which is included with Office or Office 365.