Separate the frets.  There is one long piece of fret wire, cut this into 14 pieces 1 1/2” long.  There is 1 piece of fret wire that is “bigger” that the rest.  It is your “Nut” and is installed in the first position.

Installing Frets in Fret Board

Nut

First Fret

Gently, but firmly, tap each fret into place.