On five consecutive first Saturdays,
1. Have the intention of consoling the Immaculate Heart in a spirit of reparation.
2. Go to confession (within eight days before or after the first Saturday).
3. Receive Holy Communion.
4. Say five decades of the Holy Rosary.
5. Meditate for 15 minutes on the mysteries of the Holy Rosary with the goal of keeping Our Lady company

For more information, read this article from EWTN.