Hud Asset NES Maker 4.1.5

My problem right now is I don't understand how to make my graphic on my HUD to display damage when I'm hit using the heart graphic and replacing a heart with an 'x' when I'm hit. In the tutorial they had two buttons below in the HUD Elements that are in my version if it was added or deleted from the software. So I'm confused on how to get my game to show the damage I'm getting.
 
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