Numbers can be entered in many ways.
You can simply type in the numbers if all digits are 0-9. (usually for base 10 or less)
You can use numbers/letters for 0-Z. (3NF8 = 3, 23, 15, 8)
You can put in each digit with numbers. (just type in "3,23,15,8" for the example above)
You'd have to use the last method with digits greater than Z (35) though.
Also, mixing and matching is BAD.
Numbers can be entered in several ways.
As HTML color codes, such as "#FFFFFF" (white). Number sign optional.
Standard numbers, like "255,255,255" (white, again). Use commas, spaces, or pipes.
Do NOT mix and match.
This is intended for "tinting" HTML colors, and it won't be very useful for other things.
If you don't understand all this, just click "Choose" for my handy dandy color picker.