Each color is separated onto its own line.
Line 1) Unselected/Regular Text
Line 2) Selected Text
Line 3) Disabled Options
Line 4) Other Text/UI Elements
Line 5) Background Color

A line consists of three sets of digits, separated by an "R", a "G", and a "B".
The digits between the "R" and the "G" is the RED value.
The digits between the "G" and the "B" is the GREEN value.
The digits between the "B" and the end of the line is the BLUE value.

The value can be any number between 0 and 255.

To make something RED, you would write "R255G0B0"; A red value of 255, and green and blue values of 0.