Good first step! There are still a couple steps necessary to get it working... what Nostr client are you using? Primal/Amythest/Damus directions are here..

Using Rizful.com | Megalith Lightning Docs

Rizful is an easy way to send & receive Lightning payments, either through the web, or via Nostr Wallet Connect.

... or let us know what client you are using and we will provide the tutorial