To be born again means to be recreated (regenerated) in your spirit. Such recreation can only happen by God who is the only Creator.
Every human being is alive in the flesh and dead in the spirit: dead in the sins and disobedience of God the giver of life.
Such act cannot be done by men. Man cannot create or recreate himself.
This New Birth is also called Redemption and Salvation. This redemption is done entirely by the hand of YHWH God through faith in His Messiah Yeshua Jesus.
To be born again does NOT mean simply to make a confession of faith, like Muslims do. It does NOT mean simply to make a confession of faith and do some rituals, like Jews and Christians do.
To be born again means (1) To believe in Yeshua as the Redeemer, the Messiah and the only Savior, (2) To obey YHWH whose Ten Commandments are in the Hebrew and Aramaic Scriptures, and (3) To manifest the fruit which represent that the Holy Spirit dwells in your new recreated spirit.
It is faith in Jesus and Seventeen Marks of the New Life received from YHWH which will be revealed in the next question.