You commit to be at the foot of the cross like St John, taking Mary as a mother, and offering your sufferings with Jesus, contemplating His pierced heart and receiving all the graces that come from Him with a young person especially given to you in your heart.
The commitment is for a month and can be renewed as often as wished.
The importance is the praying of the heart/offering the sufferings while keeping the young person in your heart, nothing else matters.
If you want or are able to do so: