Among the many prayers of the Rosary, the Hail Holy Queen prayer is what traditionally concludes this devotion. It is also used in many other instances, such as at the end of Night Prayer in the Liturgy of the Hours.
Here are the words for how to pray the Hail Holy Queen prayer.
Hail, Holy Queen, Mother of Mercy, our life, our sweetness and our hope!
To thee do we cry, poor banished children of Eve.
To thee do we send up our sighs, mourning and weeping in this valley of tears.
Turn, then, O most gracious Advocate, thine eyes of mercy toward us, and after this, our exile, show unto us the blessed fruit of thy womb, Jesus.
O clement, O loving, O sweet Virgin Mary.Pray for us, O holy Mother of God.
That we may be made worthy of the promises of Christ.