You need to remove the steering wheel,
1st disconnect the battery for at least 15 mins
2nd poke a mid size screwdriver through the 2 holes in the back cover to push the airbag clips and free the airbag, remove the airbag from the wheel.
3rd using a 16mm socket loosen the bolt holding the wheel on and remove the wheel, there are a lining marks on the shaft and the wheel.
4th remove the rear cover, 3 torx bolts.
5th remove the torx bolts from th spoke covers.
6th gently prise of the spoke covers taking care not to break the clips.
reassemble in the reverse order.
hope it helps.