Pray the Chaplet of Divine Mercy
The Chaplet of Mercy is recited using ordinary rosary beads of five decades. At the National Shrine of Divine Mercy in Stockbridge, Massachusetts the Chaplet is preceded by two opening prayers from the Diary of Saint Faustina and followed by a closing prayer.
[ Optional Opening Prayers:
You expired, Jesus, but the source of life gushed forth for souls, and the ocean of mercy opened up for the whole world. O Fount of Life, unfathomable Divine Mercy, envelop the whole world and empty Yourself out upon us.
O Blood and Water, which gushed forth from the Heart of Jesus as a fountain of Mercy for us, I trust in You! x3]
Begin with The Lord's Prayer, the Hail Mary and the Apostle's Creed.
http://archive.org/details/The_Chaplet_of_Divine_Mercy
Then, on the large bead before each decade:
Eternal Father,
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.
On the ten small beads of each decade, say:
For the sake of His sorrowful Passion, have mercy on us and on the whole world.
Conclude with:
Holy God, Holy Mighty One, Holy Immortal One,
have mercy on us and on the whole world. (x3)
[Optional Closing Prayer:
Eternal God, in whom mercy is endless and the treasury of compassion inexhaustible, look kindly upon us and increase Your mercy in us, that in difficult moments we might not despair nor become despondent, but with great confidence submit ourselves to Your holy will, which is Love and Mercy itself.]