Zaps ⚡️ are integral part of Nostr where we send each other small amounts of Bitcoin to content we find of value.

I guess you are posting through mastadon therefore you have not set up you lightning wallet.

Primal.net nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg is the best place to start