Backgrounds are better brought into your scene through the material room. That way gives you more control over what you can do with it. Be aware that you won't see the background image until you render if you do it this way. The default setting for backgrounds is "tiled", you need to change this to "none" and then you can resize the background image using the "U" and "V" dials. Have fun!

Injustice will be avenged.
Cofiwch Dryweryn.