link aint working 
don't get your knickers in a twist sunny

here's a quick run down
passenger side - slide a metal ruler down one side and pop the vent out
Middle - remove all the switches underneath the vents, then pop the vents off the hinges - push towards the side; undo the two screws at the back and remove the surround
Drivers - push and turn the headlight switch to 12o'clock and pull towards you and unclip the wiring. think there is a screw located behind the switch there and or behind the vent part itself
Fitting the new ones is easy - if you've got the loom i'd suggest running that before putting in the new vents - run the loom across the top of the glovebox to the middle and then from the middle underneath the steering wheel and splice into the blue/grey wire in the headlight switch