You need to borrow, buy, or 'liberate' a steering wheelpuller tool. Just take off the horn cap, and you will see a nut there. Take the nut off, and then use the puller tool to gently pull off the steering wheel. I cannot stress the GENTLE part enough here. There are delicate splines and such that need to be taken care of. The steering wheel itself can be a little delicate as well.
It's really easy to do though. Should take about 20 minutes.
Kyle