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When you are given the option to "Choose File" that is exactly how it is supposed to work.
A Background is simply a picture, or some type of image file (jpg, png, tif, etc etc)
So, you can use either the included background (only 1 i believe) or you can choose your OWN background.
When you choose a file, you then have to HAVE the imgae file ON YOUR COMPUTER to use it.
Is this making sense?
I can explain in more detail if you have questions....or are not understanding.
Just let me know, where you are confused, and be as detailed as possible.