The Replace Color tool lets you select one color and paint over it with a different color. To use the Replace Color tool, choose whether you want to select replacement colors from the swatches or from the image itself using the From drop-down. This is not always the best method to do this, but it's one of the fastest and worth knowing. Make sure to hit "play tutorial" in the top left corner of the video to start the video. There is no sound, so you'll need to watch the pop-up directions.