How do I find the Microsoft Word normal user template?
~/Library is an usually invisible folder in your user folder.

You may access the folder by entering "~/Library" after choosing Go -> Got to Folder… in the menubar while Finder is the front app.

Alternatively you may open your user folder and change the view options by choosing View -> Show View Options… and enable "Show Library Folder".

Now navigate to ../Application Support/Microsoft/Office/User Templates/My Templates and change the normal.dotm as you need.