To adjust white balance on a mirrorless camera, first, access the camera's menu system by pressing the "Menu" button. Look for the white balance settings, which are usually represented by a symbol that looks like a sun or a set of stacked squares.Once you have found the white balance settings, select it to access the different white balance options available. These options may include presets such as daylight, cloudy, tungsten, fluorescent, or custom white balance settings.