Candles are added to the  hanukkiyah  (menorah) from right to left but are kindled from left to right. The newest candle is lit first. (On the Shabbat of Hanukkah, light the Hanukkah lights first and then the Shabbat candles.) Light the  shamash  (the helper candle) first, using it to kindle the rest of the Hanukkah lights. As you do, say or sing:
 

Baruch atah, Adonai Eloheinu, Melech haolam, asher kid’shanu b’mitzvotav v’tsivanu l’hadlik ner shel Hanukkah. 

Blessed are You, Adonai our God, Sovereign of all, who hallows us with  mitzvot, commanding us to kindle the Hanukkah lights.

Baruch atah, Adonai Eloheinu, Melech haolam, she-asah nisim laavoteinu v’imoteinu bayamim hahaeim baz’man hazeh. 

Blessed are You, Adonai our God, Sovereign of all, who performed wonderous deeds for our ancestors in days of old at this season.


First Night Only

Baruch atah, Adonai Eloheinu, Melech haolam, shehecheyanu v'kiy'manu v'higiyanu laz'man hazeh.

Blessed are You, Adonai our God, Sovereign of all, who has kept us alive, sustained us, and brought us to this season.


Type of Custom: Candlelighting, Hanukkah

Holiday/Event: Chanukah

Source: https://reformjudaism.org/beliefs-practices/prayers-blessings/hanukkah-blessings