Sometimes you may want to change the coloring for a columns so that it is more biologically relevant or so that is easier for color blind individuals to see.
To change the color threshold, click on the column menu at the top and choose 'Display'. From there click 'custom', enter your new thresholds, and click 'Done'.
To change the color, click on the column menu at the top and choose 'Display'. From there choose a new set of colors from the drop down.