The process for engaging and disengaging 4 wheel drive varies depending on the make and model of your vehicle, but generally involves the following steps: First, locate the 4 wheel drive control switch or lever, which is usually located on the dashboard or center console. Second, shift the switch or lever from 2 wheel drive to 4 wheel drive high or low, depending on the driving conditions. Third, drive the vehicle slowly to allow the 4 wheel drive system to engage or disengage, depending on the direction you are moving. Finally, switch back to 2 wheel drive when you no longer need 4 wheel drive, or when conditions improve. It is important to follow the manufacturer's instructions and not engage or disengage 4 wheel drive while driving at high speeds or on dry pavement.