Cover your face with a tallis. Children in the men’s section should join their fathers underneath the tallis.
Face the Kohanim and pay close attention when the Kohanim are saying the berachos. Answer Amen to each of the berachos.
When the Kohanim say yevorechecha, keep your head in the center. When they say Hashem, tilt your head to the right. When they say veyishmerecha, move your head back to the center. Continue in this manner as follows: left, center, right, center, left, center, and so on, until the word shalom, when the head is in the center.
When the Kohanim sing the last three words, recite Ribono Shel Olam, as directed in the siddur. The words of Ribono Shel Olam should only be said while the Kohanim are singing, and not while they are saying the actual words.
However, say the last three words of the Ribono Shel Olam— veyishmereini usechoneini vesirtzeini—as the Kohanim are saying the final word, shalom. Then, immediately say Amen and Adir Bamarom.
Say Adir Bamarom while the tallis is still over your head.
It is customary to say yasher koach to the Kohanim after the Kaddish which follows chazaras hashatz.