how to add buttons in my gui menu

Hi i would like to add buttons inside my GUI menu and be able to click them to do a function can some one please help me your help will be appreciated

You can add a simple gui really fast, all you do is add a OnGUI in your script, something like this(C#):

void OnGUI()
{
  if(GUI.Button(new Rect(0,0,100,20), "button text"))
  {
    CallMethod();
  }
}
private void CallMethod()
{
  Debug.Log("CallMethod");
}

There is a lot of gui documentaion, start with the GUI.Button as Mattskate suggested.