Overlay - show if player has potion effect

if you make an overlay in the new tab button (green plus + ) it will show overlay, if you get a transparent image of blood around a boxed border, after its done on the right there is a "display overlay in-game" and make a custom procedure and just add if the player/ entity has the bleeding potion effect.

It does simply not work... what am I supposed to put into the do function. I know that I can put smth into the if function and that is if potion is active but idk what I can do to show it because there is not show overlay brick or smth.