Need help changing colors on MACD histogram

On Oanda platform. My MACD histogram is dark blue color and I like to change it to different color. Can someone please tell me how to do it?
I'm not referring to fast and slow lines that I can change. Only the histogram that appears either below or above o lines. It is almost the same color as the platform and very difficult to read it.

Thanks

You should be able to change the colour by double clicking on the indicator underneath the chart, click "colours" and change it to whataver you prefer.