You have to bless in front of ten and two out of these ten have to be learned in Halachah. And it’s good to be careful that you have twelve people including the blessing person and also including the aforementioned learned Rabbanan. If one doesn’t happen to have two learned people, even then, one should nevertheless bless and the saying of the blessing should not be prevented because of that fact. We have the custom to bless after the reading of the Torah in the assembly, when in most cases there are two halachically learned people found. And if one blesses when there are less than ten, there are those who say that one does not fulfill his obligation and there are those who say that that one fulfills. And it’s good to repeat the blessing in front of ten without Shem and Malchut but one should think of Shem and Malchut in his mind. One who blessed silently, it is as if they did not bless in front of ten, and they should repeat it in front of ten, not uttering the Shem and Malchut but thinking it in their mind.