Locate the linkage arm on the driver side of the transmission, it should be easy to see. Remove the linkage arm by loosening the bolt on the top of the arm where it comes out of the transmission, and pulling straight up. This bolt clamps the linkage arm to the transmission. There is a square nut which sits in a square groove in the linkage arm. If you remove the bolt completely, this square nut may fall out and you'll need to feel around a bit to retrieve it.