Do you already have the alby wallet connected to Damus? (Are you on Damus?)

Guide to Zeus app for alby wallet

https://guides.getalby.com/overall-guide/alby-lightning-account/connect-your-alby-lightning-account-to-other-apps/connect-to-mobile-apps/connect-to-zeus

You need zapplepay if you want to zap individual posts, or you can just zap on peoples profiles

Zapplepay instructions

https://damus.io/note1shcrq9s94vucf2alk05enluu9e9ncskw6up9s03qsu5q0sxjl4aqgzaxza