When you meet a Chamorro elder, offer a small bow and take their right hand (or lean in for a cheek), give it a light sniff or kiss, and say “ñora” or “ñot” as appropriate. Do this on arrival and again when you leave — it’s a greeting and a farewell, not a one-time formality.
Beyond the gesture itself, let elders lead conversation, don’t interrupt, and greet them before anyone else in the room. Family reputation is on the line here: a lapse in manners toward an elder reflects on your whole family, not just you — so when in doubt, err on the side of extra deference.