First, you need to install it. The requirements and installation instructions are in "Installation instructions.txt" file. Plase read it carefully, most "not working" problems are because of that! Then recruit anybody and get a car, helicopter or boat. When you and your homies are in the car, helicopter or boat, press TAB for switch the driver. A text box'll appear telling you everything that you can do being a passenger with this mod. Keep in mind that helicopters' driving AI gains altitude first, and then goes to the target. Also, boats' AI goes to the target in straight line, no matter of obstacles.