How to use a picture as a background

I have recently purchased Website Creator X5 and am a little challenged on how to set a picture for a web page background.  When I insert the image (jpg or gif) as the background, it only shows part of the image.  I assume I need to reduce the resolution of the picture down quite a bit to have the complete picture used as the web page background.  If that is correct.  What resolution do I need to go to?  If not correct.  How do I make my web page background use the image I want?

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