Therefore, I have set a Quick Start Guide in the gallery, as the Pi is inserted into the housing so that it is quicker in the subsequent buyers ;-).
Pi is used on the flat bottom tray as shown in the picture. First, it is pushed to one side under 2 plastic edges, then pushed on the other side with some force and feeling about the "fixing brackets". Then the Pi holds perfectly in the housing. Now just put the lid on it and your Pi is perfectly protected.
I would recommend this case fully and can not fault it ....
... Except that no guidance is and I initially herumprobiert a certain time, how the part is best composed. Hence only 4 stars!