The Colour Control window is very simple. On the left, you have your palette indexes (numbered 0-15). At the top is the weapon icon palette (index 0), in this example, and just below it is the weapon rank palette (index 1). On the right, you have the red, green, and blue values for the selected colour. On the GBA, each of these is represented by 3 bits for a range of 0-31. To convert to normal colours, multiply these values by 8. Likewise, colours you use must be in steps of 8, converted into 0-31. On the bottom, you may choose which colour you want to edit the values of, but it is much easier to click on a colour instead. Lastly, you can save the palettes as a .png, .gif, or .bmp.