Select Edit|Background
A background is an image that is displayed in the background of your design. The background you choose is stretched to fit the entire margin area (which is almost the entire design by default). You can change the area the background occupies by changing the margins.
To add a background perform the following steps:
1. Select Edit|Background or double click on an empty space in the design.
2. See Picking a Graphic
Also See:
Adjusting the Margins
Notes:
Metafiles (.WMF and .EMF files) work best as backgrounds because they can be scaled better than other types of graphics. Other graphic files will work but may not produce optimal results.
The background is stretched to fit within the margins.