How to Insert a Header in Microsoft Office Word

1. Open Microsoft Word. To insert a header to an existing document without one, click the 'File' tab and select 'Open.' Locate the Word document and click its file name. The document opens in a new Word window.
2. Click the 'Insert' tab. Click the 'Header' button on the ribbon below the tab. Select one of the header options, such as 'Basic.' The header is inserted.
3. Double-click the newly inserted header to activate it. Type over Word's placeholder text with information such as the date, title of the document and contact info for the author.
4. Click the red 'X' button on the ribbon to return to the body of the document. Scroll through any additional pages of the document to make sure that the header has been added.