Q. When I go to use an image, it sometimes has a square around the image I'm using. This border color is the same as the background for the PNG file I'm using.
A. You need to set the transparency. When you import the image, you'll get a preview of how the file looks, with the ability to zoom in and out. At that point, click on the background - when it flashes, that means it's transparent. The border won't appear around the character again.