As said above,
pop the bonnet
Pull the rubber seal off and th plastic cover
(Green arrow in the photo)
you’ll see the pollen filter, remove that
The resistor pack is underneath the filter on n/s of car at front
undo the tx20 torx screw (I think)
Disconnect the connector plug (this is disconnected) and the 2 other spade connections (the orange one and the brown one in photo above) these are a bit tricky, probably need long nosed pliers or equivalent.
then replace

There are a couple of variations, mine is a 5 pin connector. There is a 4 pin one too, may also be others, you’ll probably need to have a look before ordering replacement
hth