disconnect the battery for 10 mins to power down the e.c.u.
undo the 2 torx or 7mm bolts at the back of the steering wheel that hold the airbag on .
carefully lift the airbag off the steering wheel . unclip the yellow plug from the back of the airbag . the plug may need a bit of a wiggle .
job done .
if you are going to remove the steering wheel dont desturb the rotary coupler behind the steering wheel . (dont spin it round) otherwise the coil of wire inside it may snap when you turn on full lock when you have finished .