On multiplayer games, how do you control only your character?

How do people go about placing multiple characters but you can only control your own? I don’t understand that part.

In your client, add your player controller script to your object after you do network.instantiate() Something like

using UnityEngine;

public class PlayerSpawnEngine : MonoBehaviour 
{
	public Object PlayerPrefab; // set this in the inspector / editor
	private GameObject Player;

	void OnConnectedToServer() 
	{
		GameObject Player = Network.Instantiate( PlayerPrefab, OurPosition, OurOrientation, 0) as GameObject);
		Player.AddComponent<PlayerController>();
	}

	void OnDisconnectedFromServer(NetworkDisconnection info) 
	{
		Player = null;
	}
}