Please define, “High Priest” of the Joy of Satan Ministry.

[magnum.arcanum]

I’m new.  I don’t know a thing about “Priests or Priestesses”.  I understand traditional Witchcraft Priestesses and Crones, and the magnitude of that, and assume it somewhat parallels a Satanic High Priest, but haven’t got a clue.  If I was given a piece of paper and told to write down what a Satanic High Priest meant, in say a paragraph or two - what would be an intelligent way to describe the term i.e. how would “you” like it defined?