Yeah I get that, I'm having to dig through a lot of stuff to find anything anyone's said to me!
To explain, there's a spot on the group where you can breed two Tamashi together, one yours, one someone else's, or both yours. They'll hatch eggs with randomly selected traits based on the rarity of traits the parents have, and if you breed them you get one egg and the user of the other egg gets the other. Does that help explain at all?