So I have this texture from Polygon, but I want that white/gray metal color to be more brownie-bronze; where should I look to change it?
It should be that note that goes into the color:
Ideally you should first learn the ways of the shader editor to know what to look for. The Fundamentals of materials should set you right up:
https://cgcookie.com/courses/fundamentals-of-blender-materials-and-shading