Photoshop colours / Importing walkbehinds

[Synthetique]

Well.. i know how to make the pic have 16 colours or whatever it is.. but how do i know which one is nr1, 2 etc.? where do i look/choose them?

[Proskrito]

it´s on the menu>image>mode>table of colours (maybe the names aren´t the same, since i don´t use the english version, it´s in the same menu in which you choose between color modes)