How do you change the horn harness buttons on steering wheel on Land Rover Disco II 2001?

Get a star wrench or alen wrench set. Go on back side of sterring wheel and remove the airbag bolts. Slowly pull airbag off the steering wheel. Pay close attention to where the wires are attached let the airbag wrest on steering wheel and then release the cables from steering wheel. remove old harness and replace with new one. be sure you replace all the cables in the right place and carefully replace airback and 2 screws.