Problem: I can't make multiplayer inputs!!!! :-(

I want to make a multiplayer split screen car racing game. I want to make 2 cars with 2 different inputs.
I am using Unity 5.6.1f1

I added a car by using Assets → Import Package → Vehicles
The car works in single player.
However, it is not possible for me to make two cars with different inputs. They must using the same input no matter how I changed the input setting. The cars must be using the same input.
How to make two same cars with same speed but different inputs. (e.g. car 1 only use arrow keys to move and car 2 only can use w,a,s,d to move)

I am a new user of unity and I don’t know anything about coding. Please tell me the full version of the useful codes , tell me what should I name the code file, where should I add the file. I didn’t found anything useful from the asset store. Thanks.

Stuffs in my project:
Standard Assets\Vehicles(Only the things of the official unity car)

You’re going to need to find the script that is handling the inputs, and modify it to support two different sets of inputs. Then for player 1 choose the first set (WASD), and player 2 choose the second set (arrows) for example.

An issue like this will require coding, and no one is going to develop all the code for your game for you for free. You’ll find a lot of tips and helpful people on the forums, but not people willing to put in hours of free work just to save you from learning the basics.

If you want to move forward you’re going to need to learn C# or get a visual scripting tool and learn how to develop your project with it.