Need help with changing icon color on vB4

[dcuellar]

The icons I'm looking to change the color for are the ones in the picture I've included. When I hover over it, the color of the icons is blue. Now, I've found the png files "called sprites01_left" and "sprites02_left" which have those same icons. I've changed the colors of the icons and reuploaded the files, but I am not seeing the change on the site.

Is there something else I must do?

[dcuellar]

Found it. There are individual icons in the buttons folder.