Phoenix is the best self-custodial lightning wallet. So kudos. But for zaps you need your lightning node to be online all the time. The easiest way is to use a custodial service. You can set up a self hosted lightning node but that is hard mode. Custodial is ez mode.
Discussion
I like alby. It will also store your nsec (private nostr key) in the browser extension so you don't have to paste it into each nostr web client, which is very insecure.