On the driver's side of your transmission are two levers. The back one is the actual shifter. The front one is the throttle pressure lever. There is a lock nut on both front and back of the swivel where it meets that throttle lever. Basically, you will loosen the front or rear nut depending on whether you want to lengthen or shorten the rod. Then tighten the opposite lock nut to match. 1/8 of a turn will make a big difference. There is an adjustment jig that is designed to get you close. It is actually 2 parts. One locks the linkage to the pan rail and the other is a guage on where the lever should stop when pulled forward. Your trial and error will be your best bet as long as you don't go too far and lose your starting point.
