Launch Word. To add a horizontal line to an existing document, click the File tab, select "Open" and browse to the document. Otherwise, Word opens a new page for you to work with.

How to add a page in Word . To insert a blank page into your document, place your cursor near the word or line you want a new page. For example, ...

Double-click the Word header to enter Editing mode. Click the end of a line and press "Enter" if you need a blank line on which to add your graphic.