nostr:npub1cm8rf05gdat6qus8ynphsdmufahfg9pmhsaygnrrmghuff9vz7aqzgzjyl I think your best bet is the three dots to the right of their profile picture. There should be an option for a direct message. If you click the globe option while posting, you should be able to choose who sees it. It's my understanding that "private" messages aren't technically possible here and genuinely personal exchanges should use encryption.