How do I correct no response from input keys

I'm using the Rogue-like tutorial and I keep failing to get the input controls correct. Either I get nothing or arrow keys do not take player more than one space right or up. My code straight from tutorial script online:

 if(!GameManager.instance.playersTurn) return;
         int horizontal = 0;     //Used to store the horizontal move direction.
         int vertical = 0;       //Used to store the vertical move direction.
         horizontal = (int) (Input.GetAxisRaw ("Horizontal"));
         vertical = (int) (Input.GetAxisRaw ("Vertical"));
         if(horizontal != 0)
         {
             vertical = 0;
         }
         if(horizontal != 0 || vertical != 0)
         {
             AttemptMove<Wall> (horizontal, vertical);
         }