Girls and all women who are in the house (or if there isn't a woman in the house, the head of the household), light candles to usher in each night of the holiday and Shabbat. See Procedure for Holiday Candle Lighting for detailed holiday candle-lighting information.
Blessings for the evenings of September 13 and 14, 2015:
1) Ba-ruch A-tah Ado-nai E-lo-hei-nu me-lech ha-olam asher ki-deshanu be-mitzvo-tav ve-tzvi-vanu le-hadlik ner shel Yom Hazikaron.
Blessed are You, L-rd our G-d, King of the universe, who has sanctified us with His commandments and has commanded us to light the candle of the Day of Remembrance.
[Note: When reciting the following blessing on the second night of the holiday, one should have in mind the new fruit which one will subsequently be eating after Kiddush.]
2) Ba-ruch A-tah Ado-nai E-lo-hei-nu me-lech ha-olam she-heche-ya-nu ve-ki-yi-ma-nu ve-higi-a-nu liz-man ha-zeh
Blessed are You, Lord our G-d, King of the universe, who has granted us life, sustained us, and enabled us to reach this occasion.