under glove box on passenger side.
Undo the retaining screws that support the 'ceiling' facia to the passenger side footwell. Drop the facia down to reveal the plastic filter housing above. Undo the retaining screw on the filter housing cover and slide the cover off.
Pull the old filter down and out of the housing. Insert the new filter and refit the cover and screw. Refit the facia and retaining screws.