1) Recognize that you are a sinner, lost, without God, and without hope (Rom. 3:23)
2) Admit that Jesus Christ died on the cross to save you from sin by His own precious blood.
3) Come to God, turning away from sin and confessing Jesus as your Lord - and you shall be born again.
(The Holy Spirit will then make you a new creature - a new creation - cleansing you from all sin by the authority of the Word of God and by the blood of Christ which was shed to pay for your sin.)
4) Believe from your heart and confess with your mouth that God does forgive you of your sins and that you are born again.
Romans 10:9, 10 says "That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised Him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation."