Still a bit confusing but what I think you're trying to do is get rid of the black parts of the car and the black parts of the lettering.
- Make your top layer active
- Double click on that layer and open your Blending Options dialog box
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Go to the bottom of the dialog box where the sliders are:
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Working with the top sliders (This Layer) on the right, start sliding them slowly to the right. You should start seeing the blacks disappear.
You can also split that slider into two by holding down your ALT key (Option on Mac) and clicking on it to make the transition smoother by sliding each individually:
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You should end up about here:
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You can then use your eraser tool if needed to clean up any remaining naughty bits.
Now save your image as a png.
Let us know if this works for you.
- Jeff
