To use the zap feature, you have to have the TestFlight version of Damus, or you can use a different Nostr interface. Alternatively, you can go to someone profile and click on the lightning button and send sats like that
Discussion
Thanks, that’s helpful. How do I get the invitation code for the TestFlight beta for Damus?
Unfortunately I think it’s unavailable due to it having a maximum of 10000 users, so you have just have to wait for it to be integrated on the App Store version. Or you can try a different Nostr interface, I think snort has zaps