I think your door has been fitted the wrong way round, are the beads outside? (i might be wrong but the handle screws are outside).
Also to adjust the door the middle white bit will leaver off when shut with a flat screwdriver it is very flexible plastic, the screw with the hex on has a allen head on the end to adjust.
The two tiny allen screws are needed to be loosened to adjust the up/down screws that are coved by round caps top and bottom, these also are the hinge pins.
Hopefully this makes sense, i don't fancy going out and taking pictures as its dark and raining. But i can tomorrow if you need me too.