Set a file as a page background

On the Insert menu, select  Insert File Printout.
If you are using the Simplified ribbon, on the Insertmenu, select File > Insert File Printout.

Choose a file, such as a Word document or PDF and select Open.

Right-click the file and choose Set Picture as Background.

On the Insert tab, select   Printout.

Choose the file you'd like to use for the page background and select Insert.

If needed, resize the file, then control+click the image and select Set Picture as Background.