Switch the ignition lock

Hello is someone here who can help me? I got into my Opel wanted to let him on and everything at but no resistance and no ignition, he went out also no longer so I took him off the battery. New lock ordered panel and turn signal removed. So now my problem around the housing of the lock is once again a plastic cover, which I just can not get off, so I can not get to the hole where I have to enter with the screwdriver around the Z I’m grateful for every tip. LG Heipo