1. Insert the board.
2. secure with th 4 black pan head screws.
3. Insert the light pipes.
4. Close the lid. If you have not aligned the light pipes well in the previous step you can with the help of for example a screwdriver align the pipes.
5. Secure the lid with the 4 screws.
How to connect the case to another relay or manager board case
Secure it with the 4 screws.
Always be sure no power is connected when doing this step.