Do you mean running the EA once and remove it once closed? Or maybe doing it without removing the EA from the chart at all? In the first case you can do it with input parameters, in the second one via buttons.
You will have to be more specific, this block will do calculations and save the result into a variable. If you click the ? you will get the description
@cesardefez ha veces dejan de funcionar cuando el grafico o la linea del movimiento del mercado tocan los botones, en estos casos debes mover el zoom o ancho y alto del grafico para intentar volver a presionar el boton