Clio 2 Rear door locked

Hi guys, ive been given a clio 2 as my first car. Only problem is that the rear passenger door wont open. Have removed the door card, disconnected the central locking power cable and found a few bits not in the right place LOL.... big issue is that I still cant open the door? How do I open the lock??? My dad has tried with limited results (lots of swearing)



Any help would be appreciated,