[Ragingft86]

I recently got new LED lights for my whole car. I was able to install all of them today except for my tail light bulbs that I don't know how to get to. I have a picture of someone opening their tail lights that I found online. I don't know how he was able to open them like that and would like to learn how he did it if anyone knows. I have the pictures to show you what I can't access in order to add some LED bulbs.

What is the green round thing with the white rectangle/oval looking thing that is connected to the red round part of the tail light that lights up and how do I access it so I can make it brighter with LEDs and what size LEDs would I need to use?