Complete the following steps to change the colors of a color ramp.
Right-click the color ramp or a marker and select Marker Spacing»Arbitrary from the shortcut menu to switch the color ramp to arbitrary marker spacing.
Use the Operating or Positioning tools to right-click the marker next to the color ramp and select Marker Color from the shortcut menu to change the color associated with a marker.
Select the color you want from the color picker that appears.
To make the color ramp no longer blend between colors, right-click the color ramp and remove the checkmark from the Interpolate Color menu item.