You have to replace the whole lever peice. It should use a screw at the base to hold it to the turn signial cam.

 

Its been a while since i've last done one, but i believe the lever is held on with a screw, then the hazard button below i believe has to come off, and then if you move the switch one way, there will be a hidden screw, then the other way to reveal another hidden screw. When you're ready to pull the wires up the steering column, attach a piece of mechanics wire to it and pull the wire up the column. Then attach the wire to the new switch wires and pull it down. It can be kind of tricky but a little patience goes a long way.

 

hows come you are replacing the switch?, never had any problems with those, only the circuit board on the motor, when that shells out they only work on high, btw i absolutely hate doing column work but have replaced them before so you should be ok, its not as hard as it sounds just be patient