Hello, my name is Mark. thanks for stopping by. If you look at the side of the knob where it gets narrow there will be a small hole or a slot depending on the model. You need to push a small screwdriver, or a small round rod like an awl into the hole. When you do that the knob will be released and you can pull the knob straight off. Then the plate behind the knob will pull off exposing the screws behind it that hold the whole assembly together.
There is a small hole under the handle. I put a 1/8" allen in the hole and pushed but nothing seemed to move.
There is a bit of pressure that you need to apply. I need to go, so I will opt out now and see if another expert can help you any further. Good luck
Everyone is going home in ten minutes and I have to lock the doors. I will be back at 9:30 am ADT. Julie