So reconciliation is made through the remittance or retention of sins performed by the priests, according to the RCC? And that makes you an ambassador for Christ? HOW?
No. It is according to Christ. ALL of the 22 churches that make up the Catholic Church, follow the directives given by our Lord Himself.
"And when he had said this, he breathed on [them], and saith unto them, Receive ye the Holy Ghost: Whose soever sins ye remit, they are remitted unto them; [and] whose soever [sins] ye retain, they are retained." - John 20:22-23
The Catechism of the Catholic Church expands on this -
"When he celebrates the Sacrament of Penance, the priest is fulfilling the ministry of the Good Shepherd who seeks the lost sheep, of the Good Samaritan who binds up wounds, of the Father who awaits the prodigal son and welcomes him on his return, and of the just and impartial judge whose judgment is both just and merciful. The priest is the sign and the instrument of God's merciful love for the sinner." ccc 1465
"The confessor is not the master of God's forgiveness, but its servant." ccc 1466
Christ is the priest and minister of every sacrament. The human priest merely acts as an instrument.
As I said before, we aren't searching for reconciliation, we already have it in abundance.