If you would like to add an image to your menu page as a background, you should start from going to the Navigation Panel and selecting the page name there. Expand it and select the Background element. You will see the options for your menu page background in the Properties Area: Brush, Image and Video from File. When you choose the Image option, the following window will be opened:

Choose the necessary image file and click the Open button. You can select the images saved in most popular image formats as a background for your menu page. To select a different image use the Load Image button. The image will be automatically stretched or shrunk to fill the whole page space. You can change its transparency using the Transparency slider and selecting between the values from 0 (fully transparent invisible image) to 255 (null transparency - fully visible image).

Note: if you select an image as a background to your DVD menu button, you will be able to change its aspect (horizontal-vertical ratio) using the Constrain Proportions box and Restore Aspect button.