In C4D (Cinema 4D), to adjust metallic color, you need to select the object with the shader you want to modify. Then, go to the 'Material' tab and look for the 'Color' channel. Under the color channel, there should be a dropdown menu where you can select 'Metallic'. Adjust the slider to your desired metallic intensity. For more advanced control, you can also use the 'Specular' channel to adjust the reflection of the metallic surface. Remember that the settings might vary slightly depending on the shader or material type you are using.