I am the owner of my group; how do I ign a moderator, or see if there is one in the group already?

I need help with administration of my Yahoo group, specifically: how to add a Moderator, or determine if one exists already, or may have existed at some time in the past (unbeknownst to me) but may currently be inactive in the system. I am the owner, and seem to also have all the rights of a Moderator, but I'd like to add someone else in the Moderator role as a back-up. The online help section doesn't offer much advice that is relevant or actionable, and this "ask yahoo" open forum seems to be no better... the five questions that wereoffered as being in some way "similar" to mine have absolutely NO relevance to my question whatsoever. I'll leave this message here, and hope for the best...