BAe 146-100,
I am sorry to hear you are taking it back. You do not actually open up the notebook to add the RAM, there is a small panel on the bottom of the notebook for adding RAM. Just have your dad add it. It is a very simple process that takes no more than 30 seconds.
Tell him, if he adds the RAM, his notebook will run his programs a lot smoother and faster. I am sure that would make him happy.
Take Care,
Richard