We must go to the person we have injured, confess, and do what we can to make things right, as well as going to others we have spoken with and acknowledge our error in what we have said.
Matthew 5:23-24 (NKJV) "Therefore if you bring your gift to the altar, and there remember that your brother has something against you, 24 leave your gift there before the altar, and go your way. First be reconciled to your brother, and then come and offer your gift."
When one who professes to serve God wrongs or injures a brother, he misrepresents the character of God to that brother, and the wrong must be confessed, he must acknowledge it to be sin, in order to be in harmony with God. Our brother may have done us a greater wrong than we have done him, but this does not lessen our responsibility. If when we come before God we remember that another has aught against us, we are to leave our gift of prayer, of thanksgiving, of freewill offering, and go to the brother with whom we are at variance, and in humility confess our own sin and ask to be forgiven. {MB 58.3}
If we have in any manner defrauded or injured our brother, we should make restitution. If we have unwittingly borne false witness, if we have misstated his words, if we have injured his influence in any way, we should go to the ones with whom we have conversed about him, and take back all our injurious misstatements. {MB 59.1}