Changing rear light asembly

[britaxcooper]

Hey all,

This is not my car so ive never looked inside one!

How do i go about changing the passenger side rear light? the person who owns it has cracked the lens so they have got a new asembly so im going to fit it.

Id just like a little help before i start randomly trying to remove trim to get to it. Im guessing its the same as when i did my vauxhall corsa (old shape) but never worked on such a new car.