My function doesn't appears in the OnClick button script

You have to many parameters. An OnClick event should be a public, void with one or no parameters/arugments. You have 3 parameters in your method, the single parameters should be either an int, string, bool, UnityEngine.Object or float by type.

http://unity3d.com/learn/tutorials/modules/beginner/ui/ui-button

You can't call a function OnClick in the editor if it has more than 1 inbound parameter.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class Test : MonoBehaviour 
 {
     public void FunctionWorks(string name)
     {
         Debug.Log(name);
     }
 
     public void FunctionDoesntWork(string first, string second)
     {
 
     }
 }

try including this

 using UnityEngine.UI;

As Landern has pointed out, the OnClick event can only accept a single int, string, bool, UnityEngine.Object or float by type. But there is a workaround solution that can pass in multiple parameters. That is, create a utility class that contains the parameters you would like to pass in, and then pass in that class. For your case, what you can do is:

 //a separate utility class
 public class SalvarInfo : MonoBehaviour{
 public string nome_;
 public bool pinOn_;
 public int pin_;
 } 
 
 public int numSaves;
  public int[] save = new int[4];
  public string[] nome = new string[4];
  public bool[] pinOn = new bool[4];
  public int[] pin = new int[4];
  public void Salvar (SalvarInfo info) {
      if (numSaves < 5)
      {
          save[numSaves + 1] = save[numSaves + 1];
          nome[numSaves + 1] = info.nome_;
          pinOn[numSaves + 1] = info.pinOn_;
          if(pinOn[numSaves + 1] != false)
          {
              pin[numSaves + 1] = info.pin_;
          }
      }
  }

If none of these work for you, probably you have parameter for you void but you arent using them. Use them or try removing parameter. example:

 public void Start(int sceneIndex)
 {
     SceneManager.Load(1);
 }

So remove "int sceneIndex" parameter from your void or use it in void.