Before beginning, make sure that you have earthed yourself (by touching a large metal object) to avoid the chances of static damage.

Prepare the five TMC2209 stepper drivers by removing them from their packaging and securing onto them their heat sinks as shown in the first image.

Make sure the heatsink is not touching any of the pins.

Orient the fins of the heatsink as shown.

Mount all five of the TMC2209 Stepper Drivers to the control board as shown.

When installing, match the orientation of the drivers as shown, the green side of the stepper should go onto the red side of the mounts on the board.

Installing a stepper driver the wrong way round will destroy it.