First download the program here
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http://www.gimp.org/downloads/
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Then you pick the image you want to work with, open gimp, press edit column and paste the image. Then open the layer column and press add alpha channel(just like I show you on the stamp above). From now on you'll se little squares, that's because you are making a transparent image. To erase the pic you just use the eraser on the tool box. Just practice... at first the stamps won't be as nice as we want, but practice makes perfect.
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The fuzzy circle eraser is the best for transparenting the borders of the image, it will make a nicer stamp on the blings, a better and seemless blending
