Begin by making the sign of the cross and saying, “Bless me Father for I have sinned. It has been _____ (weeks, months, years) since my last confession."
Then you will tell the priest the sins that you have committed since your last confession.
You do not have to go into any explicit detail of your sins unless the priest feels it is necessary. If you feel it is necessary you can tell him the circumstances. You may also ask him for advice regarding the sin.
When you are finished, you will tell the priest, "For all my sins I am truly sorry."
The priest will briefly discuss the effects of your sins and will offer advice and encouragement on leading a better Christian life.
He will give you a penance to perform (usually a prayer or good deed) and may offer you advice to help you be a better Catholic.
The priest may ask you to say the Act of Contrition, expressing your sorrow for your sins.
Finally, the priest , acting in the person of Christ, will absolve you of your sins through the Prayer of Absolution.
At the end of his absolution he will say, “I absolve you of your sins in the name of the Father, the Son, and the Holy Spirit. ”
Make the sign of the cross and respond "Amen".
He will then dismiss you by saying some variation of “Go in peace. ” Reply, “Thanks be to God”.
As soon as possible, complete your penance and rejoice in the fact that your sins have been forgiven by the blood of Jesus Christ.