Here's basic step-by step instructions on how to adjust the neutrsl safety switch.
The neutral safety switch is located On the transmission right near where it meets the engine. You will see the arm and shift cable right on top of it when you look below the master cylinder.
-Start with the car off and set the parking brake
-Place the car in Neutral
-Find the PRNDL switch and loosen (dont remove) the two bolts holding it to the trans
-Have an assistant jump in the car and attempt to start it
-if no start have the assistant hold the key in the start position
-you go grasp the PRNDL switch and adjust it one way or another untill the car starts
-Tighten the bolts down
-Attempt to start the car in both Park and Neutral, and verify your backup lights function
-repeat process untill everything works, test drive.