There are a few different ways you can remove the background. You can do it with PhotoShop, or
GIMP, or
Paint.NET, or you can do it with
Paint and the website iaza.com. I find the last one the easiest, and it doesn't require you to download any new programs.
Alternatively, you could make a request in the
Digital Requests section and have someone else do it for you.
Here, I made it transparent for you:

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