Hearken, O Ye Gentiles, and Hear the Words of Jesus Christ, the Son of the Living God

Below, the prophet Mormon writes the words He was commanded by Christ to speak to those not yet gathered into the house of Israel in our times:

“Hearken, O ye Gentiles, and hear the words of Jesus Christ, the Son of the living God, which he hath commanded me that I should speak concerning you, for, behold he commandeth me that I should write saying: Turn, all ye Gentiles, from your wicked ways; and repent of your evil doings, of your lyings and deceivings, and of your whoredoms, and of your secret abominations, and your idolatries, and of your murders, and your priestcrafts, and your envyings, and your strifes, and from all your wickedness and abominations, and come unto me, and be baptized in my name, that ye may receive a remission of your sins, and be filled with the Holy Ghost, that ye may be numbered with my people who are of the house of Israel.” (3 Nephi 30:1-2)

Questions:

-What must happen, according to these verses, for the Gentiles of the last days to be numbered among the house of Israel?

-Who has authority directly from God to perform the baptism mentioned in the passage above?

-Who is willing to repent away from the negative actions and characteristics listed above (in preparation for a meaningful baptism by one who holds authority)?