I have the program, just dont know how to use it. I am trying to change rim colors, I use the lasso and select it, then Image/adjustments/replace color, and I pick my color and use the drop+ tool and nothing happens, I tried the - and regular as well....nothing. Can anyone tell me how to change colors in the program??

 

just select what you want, go to layers, then go to adjustment layer, then go to hue/saturation, and pick what color you want.
boom.