I keep clicking on "transparent" but I could never change any background.
The little box change to the color I choose but never the frame.

Here are my steps (for a white background):
1) Open def maker, choose adventure object and import frame.
2) Leave "special colors" uncheked, click on the colored box "transparent", choose teal or any color, and now when I click again, it shows "choose automatic" and becomes white. If I don't choose a color it will not let me choose automatically. After it was choosen, do I have to click somewhere?
3) Generate shadow (maybe this has to be done before 2?)

I uploaded the bmp., maybe you can try it some day and tell me if something wrong. (has black ground)

WoG object