On the facelift theres just two slots on the back of the wheel, as Kev said you need to flick the clips off them whilst gently easing the airbag assembly toward you... they can be fiddly to do, a small flat tip screwdriver or a pick are useful here as is some patience lol
Once released there are connections to remove, two spade terminals which are different sizes so no need for marking them for reconnecting, then there are two yellow and orange connectors, flick the orange part out and the yellow part should slide out and theres also a black terminal block for the controls on the wheel.
Its then a 24 mil socket, extension and ratchet to get the retaining bolt out. Just make sure none of the wires snag up on anything as you draw the wheel out and make sure the clock spring stays in place.
Refitting is just a reversal with no need to fiddle with the airbag clips, the airbag should just push in and you will hear the clips click into place.
Make sure the battery is disconnected whilst removing the airbag!