During Aseret Y’mei Teshuvah, one recites Hamelech Hakadosh at the end of the third Brachah, and Hamelech Hamishpat at the end of the eleventh Brachah.
One who did not say Hamelech Hakadosh: If he realized before he began the next Brachah and within the time frame it takes to say three words, he corrects his mistake. Otherwise, he must begin the Amidah again. [The same applies if this occurs in Chazarat Hashatz, in which case Kedushah is recited again.]
If one is in doubt whether he said Hamelech Hakadosh, he needs to repeat the Amidah.
One who did not say Hamelech Hamishpat: If he realized before he began the next Brachah and within the time frame it takes to say three words, he may correct his mistake. Otherwise, he should continue the Amidah without correcting his mistake.
If one mistakenly omitted any of the other four additions (Zachreinu, Mi Chamocha, u’Chtov, u’Vsefer Chaim), he may recite it at the place he remembers if he has not yet said Hashem’s name at the end of that Brachah. Otherwise, he continues the Amidah and does not go back.
During Chazarat Hashatz, the congregation recites the selections of U’Chtov and u’Vsefer Chaim aloud before the Chazzan. Some also say Zachreinu Lechaim and Mi Chamocha aloud too.
