We can help the holy souls by gaining plenary indulgences for them. A plenary indulgence is the remission of all the punishment due to sin. Each time we gain such an indulgence for a soul in Purgatory, we help to release that soul into the joy of Heaven.
November Plenary Indulgences for the Holy Souls: Conditions
1. Church Indulgence; a plenary indulgence may be gained, one per day, by visiting a church or oratory and reciting one Apostles’ Creed and one Our Father.
2. Cemetery Indulgence; a plenary indulgence may also be gained, one per day, by visiting a cemetery.
For each indulgence the obligations of receiving Communion and praying for the Pope’s intentions must be fulfilled, but it is sufficient to go to Confession once for several indulgences.