remove the large plastic nut by the lever. Pull it out the back. Pry the bottom off of the "box" where the cable goes in. the old rod and spring will come out. Thats the easy part. When you re-assemble it you have put the spring back in with the new rod and get the cables in right. Now the tricky part. You need three hands, or a friend, you pull up the rod enough to put the lever and pin on it. Problem is you cant hold it up and put it on at the same time, hense the third hand. You can pull the enrichener plungers out of the carbs, take the cable off and slack it that way, if you can get to the carbs easily.
One a side note.. if you get one of the aftermarket kits, the plastic is pretty soft, it may help to safety wire the pin so it doesn't work its way out.