[Solved]-HighCharts, how to change the coloring on the headline on the y-axis?-Highcharts

You can set the color for the title and subtitle like you would set any other color in Highcharts :

title: {
      style: {
         color: '#FFCC00',
         font: '16px Lucida Grande, Lucida Sans Unicode, Verdana, Arial, Helvetica, sans-serif'
      }
   },
   subtitle: {
      style: {
         color: '#FFCC00',
         font: '12px Lucida Grande, Lucida Sans Unicode, Verdana, Arial, Helvetica, sans-serif'
      }
   },

FIDDLE