User blog comment:SnickersDoge/Custom Player Cards/@comment-5687578-20121216030614/@comment-4500149-20121216051115

You need to download an image editing program that supports transparency. MS Paint currently doesn't support this. Here are a few that do: Paint.NET, GIMP, Photoshop. Those are the ones I have on my computer. Paint.NET and GIMP are freeware, so you would probably be looking to download those. Either would work fine, but I personally use Paint.NET (only because it's basic and what I started with).