To allow stat tracking, we will simply drag the StatTracker script and drop it on the main camera. Now, to show the menu for stats, we will need to add an Update function. Add this to your script:

void Update()
{
  if(Input.GetKeyUp(KeyCode.E))
  {
    if(showStats)
      showStats = false;
    else
      showStats = true;
  }
}

Now when the player presses the E key, it will toggle the showStats Boolean variable. The stats menu will only show when showStats is set to true.