Where to see my app log

I'm debugging my android app using unity3d. I connected device to unity. When i run the app i need to see the below code log. But where to see this log. I tried in forum, but i didn't understand.

  public void OnButtonPressed(VirtualButtonBehaviour vb)
     {
          Debug.Log("OnButtonPressed for " + vb.VirtualButtonName );
 
 }