You just need to know his PubKey and IP/Tor address combo. You can get that in Start9 by going to LND, clicking Properties, and copying the Node URI value:
Cameron (npub1qpm…8t0l) Harvey :pci: ☕♫ (npub1ng7…k6kc) Spencer (npub13qq…9xy8) ⚡️Salty Crayon (npub1agk…meyv)