Plebstr is great. If you don’t have a wallet already, Wallet of Satoshi is a popular one and has good support for Nostr features. You can download it from the App Store and they’re here on nostr nostr:npub1hcwcj72tlyk7thtyc8nq763vwrq5p2avnyeyrrlwxrzuvdl7j3usj4h9rq . Once it’s setup, copy your Lightning address from Wallet of Satoshi (it looks like an email address) and paste it into your zap settings in Plebstr. Screenshots below for reference. You can also set it as the default wallet for sending on that same settings page.