You got a source for that cause that doesn't seem correct.
Cause it doesnt make sense to me if they continue to confess their sins if their sins were already forgiven.
Presbyterianism, rooted in the Scottish Reformed tradition of John Knox is part of the larger Reformed Theological Tradition (Calvin, Zwingli, and Knox). Orthodox Calvinism can largely be summed up in the acrostic known as TULIP defined at the Synod of Dordtrecht, which addressed the Remonstrant Controversy. The Remonstrants were what Jacob Arminius and his followers were called, and their position is summed in the Five Articles of Remonstrance--which the Five Articles of "TULIP" intend to refute.
This was an in-house debate that arose within the Dutch Reformed Church in the early 17th century. But it extends well beyond the Dutch Reformed Church and is one of the most important issues within the Reformed Tradition of Protestantism broadly, as such TULIP has come to define Reformed orthodoxy; to the point that the view of the Remonstrants though themselves Reformed are considered their own thing: Arminianism. Arminianism did not start to pick up steam outside of some small circles until it was embraced by John Wesley, the founder of Methodism.
TULIP stands for:
Total Depravity (or Total Inability)
Unconditional Election
Limited Atonement
Irresistable Grace
Perseverance of the Saints
Thus those who adhere to TULIP belief, teach, and confess that since a person is either one of the Elect, chosen and predestined by God to hear and believe the Gospel (Irresistable Grace) and such a person cannot fall away but the Holy Spirit preserves and keeps them in faith because God decreed they would be--or a person is a reprobate and it is impossible for such a person to ever be saved, and Jesus didn't die for them anyway since Jesus only died for the elect (Limited Atonement).
Presbyterianism, historically, adheres to TULIP. Depending on the particular denomination of Presbyterianism today, I'm sure one can find varying degrees of agreement with TULIP among both those in the pews and the clergy; but historically Presbyterianism is emphatically Reformed/Calvinist in its theology.
That said, I am unaware of anything in the historic Reformed tradition, or Presbyterianism, that would suggest the Christian doesn't need to repent and seek forgiveness. Repentance and seeking forgiveness is not, in Christianity (whether Catholic, Lutheran, Reformed, Orthodox, etc) a matter of "staying saved"; but is instead understood as being the ordinary life of desiring Jesus and following Him. Repentance is a non-negotiable imperative for every Christian, and this is held to be true in every major and mainstream Christian tradition.
I certainly have met Christians who say they don't have to repent or ask for forgiveness, but this has always been a position that is outside the historic norms, and tends to exist only on the far-flung fringes. To say there are Christians who don't believe they have to repent or ask for forgiveness is like saying there are Christians who don't believe the Bible is divinely inspired, or that there are Christians who believe white Anglo-Saxon people are the "true Israelites". Sure, there are weird ideas out there, there are over two billion people who identify as Christian on the planet.
-CryptoLutheran
