Fix four stand-offs to the base:

M3 x 10mm threaded stand-off

M3 x 6mm Button

Before removing the control board from it's packaging, make sure that you are earthed, you can do this by touching a large metal object. This is to ensure a static shock doesn't damage the board.

Fix the board onto the mounts with four M3 x 6mm button head bolts.

Make sure the board is orientated as shown.

Plug the electronics fan into the control board as shown.