I am attempting to edit a Keynote chart (Scatter plot) with 3 data series. I selected the first Chart option which plots the data by color (Blue, red, white). I do not see an option to adjust or change the default colors. In the "Edit Chart Data" dialog, the series colors appear at the column head but there is no apparent way to change the default color. The white data series wouldn't be so bad except that the background of the chart is also white.