Oh okay...I don't know about Damus btw, I thought you are an android user like me... 😁 Btw Primal itself has a build-in wallet (at east on my Primal Android app). So it's pretty simple for me. LN means Lightning Network. It's like Apple Pay, a method of easy and fast Bitcoin transactions, mostly used for small amount transactions.

For example, this is my LN address from Blink wallet app on my phone: pallabjd@blink.sv It's an Bitcoin Lightning wallet. And I just add this LN address to my ID on Primal, by editing the profile. That's it. When somebody zaps me, sats directly goes to my Blink wallet.