How can I make a point in an image in black and white are the colors?

I know this question has been asked a million times, but I need know how to do it in Photoshop CS3 and have not seen instructions on how to do yet. Please help.

There are several ways to do that you can paint with the tool paint, everything else is too complicated to explain in this brief space. Take a basic course. It took 3 years to master Photoshop is not easy.

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