Jesus said to Blessed Faustina Kowalska: “Even the most hardened sinner, if he recites this chaplet even once, will receive grace from My infinite Mercy.”
(This prayer is said using ordinary rosary beads.)
First, make the Sign of the Cross.
Then say one Our Father, one Hail Mary and the I believe in God (the Apostle’s Creed).
Then, on the Rosary beads (on the Our Father beads), say one time:
I offer You the Body and Blood,
Soul and Divinity
of Your dearly beloved Son,
Our Lord Jesus Christ,
in atonement for our sins
and those of the whole world.
and then (on the Hail Mary beads) say ten times:
For the sake of His sorrowful Passion
have mercy on us
and on the whole world.
Repeat these prayers on the Rosary beads for one chaplet (a total of five sets). You will then have said the Eternal Father prayer a total of five times and the For the sake of His sorrowful Passion prayer a total of fifty times.
Conclude by saying three times:
Holy God, Holy Mighty One, Holy Immortal One, have mercy on us and on the whole world.
Also, go to Confession frequently (at least once a month), go to Mass and receive Communion regularly, and pray for the intentions of the Pope.