Okay, I would suggest moving it to photoshop and making it transparent. An easy way of doing this is removing the back ground layer by cutting the image out of the background, closing the window and opening up a new canvas.
Paste the image onto the canvas.
Go to your 'layers' window which, if you cannot find it, you should be able to locate it on the top menu by going to Window --> Layers
Go to your layers window and then go to the 'channels' tab. Click the thing that looks like a hollow circle, it's very small and it's at the very bottom of the channels tab/layers window.