Go here, make an account.
Add your new @coinos.io address as your lightning address in your Nostr app. If you don't know how, try #asknostr, we will help 🤙
Discussion
Oh nice, an option that works in the US and isn't based in China. Speed.app has worked fine enough for me, but given that it appears run out of China I usually assume everything on there is play money and may disappear at any point. Not that anyone should assume otherwise with ANY custodial service, but it feels especially true in this case.