Κοπελιά= κοπέλλα= young woman, so in the song he is asking for the Virgin Mary to ensure that no girl will be left without a husband.
δώσε μου, κόρη, το φιλί, μη θέλεις παρακάλια give me, maiden, the kiss, do not ask me to beg for it.
Θέλω το κακό κάποιου= I want bad things to happen to that...