To receive a plenary indulgence for the souls in Purgatory: While visiting a cemetery during the Octave of the Feast of the Holy Souls, after a pious Confession and Holy Communion, pray for the intentions of the Church, and offer prayers (silently or out loud) for the dearly departed. A traditional prayer for this occasion is the beautiful de Profundis. Some pray six Our Fathers, six Hail Marys and six Glory Bes. There is not a set of prescribed prayers for the dead that is necessary, so it's really up to you. You may gain this plenary indulgence once each day during this octave!