[Solved]-Highcharts: how to change the yAxis title programatically?-Highcharts

You can use the axis.setTitle-method, as in this JSFiddle example.

The method takes in the parameters:

setTitle(Object title, [Boolean redraw])

Example code would be:

chart.yAxis[0].setTitle({ text: 'The other title' });

The yAxis is an array since there may be multiple y-axis.