Help needen for 74HC165 PCB

[Rehsifmas]

Hi there,
I'm building a 3d printed helicopter collective for a flightsimulator. I bought the shift register PCB as show in the image. But can anybody help me out how to connect buttons to it and how to set it up. Because I tried with no succes. I get it connected to the blue pill and I can see it in Freejoy. But it doens't register when I push a button

Thanks in advance