英语翻译想问下网络回帖中经常用到的“ 楼上的" 英文地道的应该怎么说

They don't seem to have such a term in English that refers to board games.People like to say "one post back","quoted from Mr.X a few posts back".Maybe you could just call it "the last poster","the next poster".
But they do call what we call 楼主 the original poster (OP) or the thread starter.
They don't yet realize a thread is like a cyber building.Ha Ha.:/

the upstair