[photoshop-beginners] Learning Photoshop CS

I am a new member just joining and I hope to learn how to use Photoshop CS. When I look under "Help" then "About Photoshop..." it just tells me it is version 8.0 just so you know what I am working with. I would appreciate if someone would help me with this please?

If I have a circle that is 500px in diameter white with a black border and inside of that is a circle that is 450px diameter centered inside and black with another circle centered inside it that is 350px in diameter with white inside. All layers have been flattened I believe because in the Layers box they show only one layer. In other words I have a tiny black circle border then a small (50px) white inside of it then the 450px black circle inside that with a 350px white circle inside that. I'd like to make that first 50px white inside circle gold instead of white.

I hope that description is understandable, I'm not sure how to describe it. Can someone please tell me how to change the white to a gold color and maybe the black inner circle into red or something.

I'd really appreciate your help, I am not very knowledgeable with Photoshop. Thank you, John D.

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