I got this from Our Lady of the Rosary Library
THE USE OF THE MEDAL
It may be worn about the neck, attached to the scapular or the rosary, or otherwise carried devoutly about one's person. For the sick it can be placed on wounds, dipped in medicine or in water which is given to them to drink.
The Medal is frequently put into the foundation of houses or in walls, hung over doors, or fastened on stables and barns to call down God's protection and blessing. It is also buried in fields, as the saintly Father Paul of Moll advised his friends to do.
No particular prayers are prescribed, for the very wearing and use of the Medal is considered a silent prayer to God to grant us, through the merits of St. Benedict, the favors we request. However, for obtaining extraordinary favors, it is highly recommended to perform special devotions in honor of the holy Father St. Benedict, for instance, on Tuesday, on which day the Church commemorates the death of the holy Patriarch. The Way of the Cross is also highly recommended or a novena to St. Benedict. His feast is celebrated March 21st, two days after the feast of St. Joseph.