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 now or may have existed but may be inactive in the system now. I am the owner, and seem to have all the rigts 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 5 questions that were originally offered 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...