Door lights fitting

Hello briskodians!

This time I am seeking advice on door lights. I want to fit new lights in my doors because when I fitted my regulator and panel last week, I noticed that I don't have door lights! Just a piece of red plastic where the light should be.

I can't for the life of me find a decent tutorial video that shows how to wire up the new light! 

So my question is how the hell do I wire it? Where do I attach the wires so that the light comes on when the door is opened? 

As always, Thanks in advance.