Any serious editing software is going to allow you to white balance. You can use Digital Photo Professional which is included with the camera, or you can use a third party program like Lightroom or Photoshop. It's generally going to be depected as two sliders. One slider controls the color temperature in degrees kelvin (you should be familiar with that measurement), and the other slider controls tint (green on one end to red on the other). Most programs will also have a tool that typically looks like an eyedropper that you can use to set a reference point. In other words, if you take a picture with a white balance card in the tank as suggested in my previous post, you can click on the white balance card with the eye dropper, and it will automatically adjust your white balance to the "correct" values.