You can change the Hair colour for a 3D Head by going to Create > Accessory Settings from the Menu Bar. You can then adjust the Hue, Brightness, Saturation and Contrast to change the colour. In addition, you can also save the texture map for the hair and edit it in an external image editor. For 2D heads, you will need to make the changes to hair colour in your source image prior to creating the 2D Head.
Unfortunately due to the different file formats used, CTA content is not compatible with CrazyTalk 8.