We wash hands and make a blessing. When one washes one’s hand for the meal making sure to wash one’s entire hand, as the decisors of Jewish law say. This is called Rachtzah - in other words rachatz hay (wash all five fingers). I have seen some who refer to it as Maggid Rachtzah since we washed one’s hands earlier for the first dipping, and we recited the blessing Al Netilat Yadaim, and now we do so again before the meal. Since the recitation of the Haggadah was an interruption we must recite the blessing for washing again before we eat. Blessed are You, Adonai our God, King of the Universe, who has sanctified us with His commandments and has commanded us on the washing of the hands.