Depending on the app he's using, I'd recommend going to getalby.com and making an account. Then go to https://nwc.getalby.com and connect to your nostr client.
Here's a video for Amethyst
https://guides.getalby.com/overall-guide/alby-lightning-account/connect-your-alby-lightning-account-to-other-apps/connect-to-mobile-apps/connect-to-amethyst
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Guide* lol
