Candles are added to the Chanukiyah from right to left but are kindled from left to right. The newest candle is lit first. (On the Shabbat of Hanukkah, kindle 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; say or sing:
Blessed are You, Adonai our God, Sovereign of all, for giving us life, for sustaining us, and for enabling us to reach this season.
We kindle these lights because of the wondrous deliverance You performed for our ancestors. During these eight days of Hanukkah, these lights are sacred; we are not to use them but only to behold them, so that their glow may rouse us to give thanks for Your wondrous acts of deliverance.